unknown exception related to background tasks button

[chenyuheng]

JabRef version 5.0 on Windows 10

• Mandatory: I have tested the latest development version from http://builds.jabref.org/master/ and the problem persists

Steps to reproduce the behavior:

1. Restore the jabref window to a small enough size.
2. Click the toggle button of tool bar in the right.
3. Click on the rightmost button in the tool bar (the background tasks button)
4. Click on the desktop and the unknown exception will occur

Log File

09:55:58.019 [JavaFX Application Thread] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[JavaFX Application Thread,5,main]
java.lang.NullPointerException: null
  at com.sun.javafx.tk.quantum.GlassScene.getClearColor(GlassScene.java:334) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.SceneState.update(SceneState.java:100) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.updateSceneState(GlassScene.java:277) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.releaseSynchronization(GlassScene.java:138) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:411) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:438) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:563) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:543) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:536) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:342) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174) ~[javafx-graphics-14-win.jar:?]
  at java.lang.Thread.run(Thread.java:832) [?:?]
09:55:58.064 [JavaFX Application Thread] INFO  org.jabref.gui.util.ThemeLoader - Enabling live reloading of D:\Repo\JetBrains\IdeaProjects\jabref\build\resources\main\org\jabref\gui\Base.css
09:55:58.113 [JavaFX Application Thread] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[JavaFX Application Thread,5,main]
java.lang.NullPointerException: null
  at com.sun.javafx.tk.quantum.GlassScene.getClearColor(GlassScene.java:334) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.SceneState.update(SceneState.java:100) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.updateSceneState(GlassScene.java:277) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.releaseSynchronization(GlassScene.java:138) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:411) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:438) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:563) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.PaintCollector.liveRepaintRenderJob(PaintCollector.java:327) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:883) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:843) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleViewEvent$15(GlassViewEventHandler.java:924) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleViewEvent(GlassViewEventHandler.java:923) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.handleViewEvent(View.java:540) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.notifyResize(View.java:880) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow._setBounds(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow.setBounds(WinWindow.java:147) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.WindowStage.setBounds(WindowStage.java:339) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$TKBoundsConfigurator.apply(Window.java:1554) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.applyBounds(Window.java:1412) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.adjustSize(Window.java:316) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.sizeToScene(Window.java:282) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$12.invalidated(Window.java:1154) ~[javafx-graphics-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110) ~[javafx-base-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145) ~[javafx-base-14-win.jar:?]
  at javafx.stage.Window.setShowing(Window.java:1174) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.show(Window.java:1189) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.show(Stage.java:273) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:463) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174) ~[javafx-graphics-14-win.jar:?]
  at java.lang.Thread.run(Thread.java:832) [?:?]
09:55:58.115 [JavaFX Application Thread] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[JavaFX Application Thread,5,main]
java.lang.NullPointerException: null
  at com.sun.javafx.tk.quantum.GlassScene.getClearColor(GlassScene.java:334) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.SceneState.update(SceneState.java:100) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.updateSceneState(GlassScene.java:277) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.releaseSynchronization(GlassScene.java:138) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:411) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:438) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:563) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:543) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:536) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:342) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174) ~[javafx-graphics-14-win.jar:?]
  at java.lang.Thread.run(Thread.java:832) [?:?]
09:55:58.121 [JavaFX Application Thread] INFO  org.jabref.gui.util.ThemeLoader - Enabling live reloading of D:\Repo\JetBrains\IdeaProjects\jabref\build\resources\main\org\jabref\gui\Base.css
09:55:58.144 [JavaFX Application Thread] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[JavaFX Application Thread,5,main]
java.lang.NullPointerException: null
  at com.sun.javafx.tk.quantum.GlassScene.getClearColor(GlassScene.java:334) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.SceneState.update(SceneState.java:100) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.updateSceneState(GlassScene.java:277) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.releaseSynchronization(GlassScene.java:138) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:411) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:438) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:563) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.PaintCollector.liveRepaintRenderJob(PaintCollector.java:327) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:883) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:843) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleViewEvent$15(GlassViewEventHandler.java:924) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleViewEvent(GlassViewEventHandler.java:923) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.handleViewEvent(View.java:540) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.notifyResize(View.java:880) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow._setBounds(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow.setBounds(WinWindow.java:147) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.WindowStage.setBounds(WindowStage.java:339) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$TKBoundsConfigurator.apply(Window.java:1554) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.applyBounds(Window.java:1412) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.adjustSize(Window.java:316) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.sizeToScene(Window.java:282) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$12.invalidated(Window.java:1154) ~[javafx-graphics-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110) ~[javafx-base-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145) ~[javafx-base-14-win.jar:?]
  at javafx.stage.Window.setShowing(Window.java:1174) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.show(Window.java:1189) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.show(Stage.java:273) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:463) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174) ~[javafx-graphics-14-win.jar:?]
  at java.lang.Thread.run(Thread.java:832) [?:?]
09:55:58.148 [JavaFX Application Thread] INFO  org.jabref.gui.util.ThemeLoader - Enabling live reloading of D:\Repo\JetBrains\IdeaProjects\jabref\build\resources\main\org\jabref\gui\Base.css
09:55:58.169 [JavaFX Application Thread] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[JavaFX Application Thread,5,main]
java.lang.NullPointerException: null
  at com.sun.javafx.tk.quantum.GlassScene.getClearColor(GlassScene.java:334) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.SceneState.update(SceneState.java:100) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.updateSceneState(GlassScene.java:277) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.releaseSynchronization(GlassScene.java:138) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:411) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:438) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:563) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.PaintCollector.liveRepaintRenderJob(PaintCollector.java:327) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:883) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:843) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleViewEvent$15(GlassViewEventHandler.java:924) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleViewEvent(GlassViewEventHandler.java:923) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.handleViewEvent(View.java:540) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.notifyResize(View.java:880) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow._setBounds(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow.setBounds(WinWindow.java:147) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.WindowStage.setBounds(WindowStage.java:339) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$TKBoundsConfigurator.apply(Window.java:1554) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.applyBounds(Window.java:1412) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.adjustSize(Window.java:316) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.sizeToScene(Window.java:282) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$12.invalidated(Window.java:1154) ~[javafx-graphics-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110) ~[javafx-base-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145) ~[javafx-base-14-win.jar:?]
  at javafx.stage.Window.setShowing(Window.java:1174) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.show(Window.java:1189) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.show(Stage.java:273) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:463) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174) ~[javafx-graphics-14-win.jar:?]
  at java.lang.Thread.run(Thread.java:832) [?:?]
09:55:58.171 [JavaFX Application Thread] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[JavaFX Application Thread,5,main]
java.lang.NullPointerException: null
  at com.sun.javafx.tk.quantum.GlassScene.getClearColor(GlassScene.java:334) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.SceneState.update(SceneState.java:100) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.updateSceneState(GlassScene.java:277) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.releaseSynchronization(GlassScene.java:138) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:411) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:438) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:563) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:543) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulseFromQueue(QuantumToolkit.java:536) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.lambda$runToolkit$11(QuantumToolkit.java:342) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174) ~[javafx-graphics-14-win.jar:?]
  at java.lang.Thread.run(Thread.java:832) [?:?]
09:55:58.175 [JavaFX Application Thread] INFO  org.jabref.gui.util.ThemeLoader - Enabling live reloading of D:\Repo\JetBrains\IdeaProjects\jabref\build\resources\main\org\jabref\gui\Base.css
09:55:58.197 [JavaFX Application Thread] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[JavaFX Application Thread,5,main]
java.lang.NullPointerException: null
  at com.sun.javafx.tk.quantum.GlassScene.getClearColor(GlassScene.java:334) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.SceneState.update(SceneState.java:100) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.updateSceneState(GlassScene.java:277) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.releaseSynchronization(GlassScene.java:138) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:411) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:438) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:563) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.PaintCollector.liveRepaintRenderJob(PaintCollector.java:327) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:883) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:843) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleViewEvent$15(GlassViewEventHandler.java:924) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleViewEvent(GlassViewEventHandler.java:923) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.handleViewEvent(View.java:540) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.notifyResize(View.java:880) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow._setBounds(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow.setBounds(WinWindow.java:147) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.WindowStage.setBounds(WindowStage.java:339) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$TKBoundsConfigurator.apply(Window.java:1554) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.applyBounds(Window.java:1412) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.adjustSize(Window.java:316) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.sizeToScene(Window.java:282) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$12.invalidated(Window.java:1154) ~[javafx-graphics-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110) ~[javafx-base-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145) ~[javafx-base-14-win.jar:?]
  at javafx.stage.Window.setShowing(Window.java:1174) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.show(Window.java:1189) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.show(Stage.java:273) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:463) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174) ~[javafx-graphics-14-win.jar:?]
  at java.lang.Thread.run(Thread.java:832) [?:?]
09:55:58.202 [JavaFX Application Thread] INFO  org.jabref.gui.util.ThemeLoader - Enabling live reloading of D:\Repo\JetBrains\IdeaProjects\jabref\build\resources\main\org\jabref\gui\Base.css
09:55:58.226 [JavaFX Application Thread] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[JavaFX Application Thread,5,main]
java.lang.IllegalStateException: The window has already been closed
  at com.sun.glass.ui.Window.checkNotClosed(Window.java:336) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Window.getNativeWindow(Window.java:366) ~[javafx-graphics-14-win.jar:?]
  at com.sun.prism.PresentableState.update(PresentableState.java:368) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.SceneState.update(SceneState.java:103) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.updateSceneState(GlassScene.java:277) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.WindowStage.lambda$setScene$1(WindowStage.java:301) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.runWithRenderLock(QuantumToolkit.java:430) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.WindowStage.setScene(WindowStage.java:294) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$12.invalidated(Window.java:1130) ~[javafx-graphics-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110) ~[javafx-base-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145) ~[javafx-base-14-win.jar:?]
  at javafx.stage.Window.setShowing(Window.java:1174) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.hide(Window.java:1199) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.PopupWindow.hide(PopupWindow.java:486) ~[javafx-graphics-14-win.jar:?]
  at org.controlsfx.control.PopOver.lambda$hide$5(PopOver.java:530) ~[controlsfx-11.0.1.jar:?]
  at javafx.animation.Animation.finished(Animation.java:1131) ~[javafx-graphics-14-win.jar:?]
  at javafx.animation.AnimationAccessorImpl.finished(AnimationAccessorImpl.java:49) ~[javafx-graphics-14-win.jar:?]
  at com.sun.scenario.animation.shared.SingleLoopClipEnvelope.timePulse(SingleLoopClipEnvelope.java:101) ~[javafx-graphics-14-win.jar:?]
  at javafx.animation.Animation.doTimePulse(Animation.java:1101) ~[javafx-graphics-14-win.jar:?]
  at javafx.animation.Animation$1.lambda$timePulse$0(Animation.java:186) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at javafx.animation.Animation$1.timePulse(Animation.java:185) ~[javafx-graphics-14-win.jar:?]
  at com.sun.scenario.animation.AbstractMasterTimer.timePulseImpl(AbstractMasterTimer.java:344) ~[javafx-graphics-14-win.jar:?]
  at com.sun.scenario.animation.AbstractMasterTimer$MainLoop.run(AbstractMasterTimer.java:267) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:559) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.PaintCollector.liveRepaintRenderJob(PaintCollector.java:327) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:883) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:843) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleViewEvent$15(GlassViewEventHandler.java:924) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleViewEvent(GlassViewEventHandler.java:923) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.handleViewEvent(View.java:540) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.notifyResize(View.java:880) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow._setBounds(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow.setBounds(WinWindow.java:147) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.WindowStage.setBounds(WindowStage.java:339) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$TKBoundsConfigurator.apply(Window.java:1554) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.applyBounds(Window.java:1412) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.adjustSize(Window.java:316) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.sizeToScene(Window.java:282) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$12.invalidated(Window.java:1154) ~[javafx-graphics-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110) ~[javafx-base-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145) ~[javafx-base-14-win.jar:?]
  at javafx.stage.Window.setShowing(Window.java:1174) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.show(Window.java:1189) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.show(Stage.java:273) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:463) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174) ~[javafx-graphics-14-win.jar:?]
  at java.lang.Thread.run(Thread.java:832) [?:?]
09:55:58.229 [JavaFX Application Thread] ERROR org.jabref.FallbackExceptionHandler - Uncaught exception occurred in Thread[JavaFX Application Thread,5,main]
java.lang.IllegalStateException: The window has already been closed
  at com.sun.glass.ui.Window.checkNotClosed(Window.java:336) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Window.getNativeWindow(Window.java:366) ~[javafx-graphics-14-win.jar:?]
  at com.sun.prism.PresentableState.update(PresentableState.java:368) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.SceneState.update(SceneState.java:103) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.updateSceneState(GlassScene.java:277) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassScene.releaseSynchronization(GlassScene.java:138) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.Scene$ScenePulseListener.pulse(Scene.java:2545) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.lambda$runPulse$2(Toolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.Toolkit.runPulse(Toolkit.java:411) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.Toolkit.firePulse(Toolkit.java:438) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(QuantumToolkit.java:563) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.PaintCollector.liveRepaintRenderJob(PaintCollector.java:327) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:883) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler$ViewEventNotification.run(GlassViewEventHandler.java:843) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleViewEvent$15(GlassViewEventHandler.java:924) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolkit.java:412) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleViewEvent(GlassViewEventHandler.java:923) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.handleViewEvent(View.java:540) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.View.notifyResize(View.java:880) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow._setBounds(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinWindow.setBounds(WinWindow.java:147) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.WindowStage.setBounds(WindowStage.java:339) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$TKBoundsConfigurator.apply(Window.java:1554) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.applyBounds(Window.java:1412) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.adjustSize(Window.java:316) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.sizeToScene(Window.java:282) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window$12.invalidated(Window.java:1154) ~[javafx-graphics-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.markInvalid(BooleanPropertyBase.java:110) ~[javafx-base-14-win.jar:?]
  at javafx.beans.property.BooleanPropertyBase.set(BooleanPropertyBase.java:145) ~[javafx-base-14-win.jar:?]
  at javafx.stage.Window.setShowing(Window.java:1174) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Window.show(Window.java:1189) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.show(Stage.java:273) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:463) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoopImpl(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._enterNestedEventLoop(WinApplication.java:201) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.Application.enterNestedEventLoop(Application.java:509) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.EventLoop.enter(EventLoop.java:107) ~[javafx-graphics-14-win.jar:?]
  at com.sun.javafx.tk.quantum.QuantumToolkit.enterNestedEventLoop(QuantumToolkit.java:635) ~[javafx-graphics-14-win.jar:?]
  at javafx.stage.Stage.showAndWait(Stage.java:465) ~[javafx-graphics-14-win.jar:?]
  at javafx.scene.control.HeavyweightDialog.showAndWait(HeavyweightDialog.java:162) ~[javafx-controls-14-win.jar:?]
  at javafx.scene.control.Dialog.showAndWait(Dialog.java:346) ~[javafx-controls-14-win.jar:?]
  at org.jabref.gui.JabRefDialogService.showErrorDialogAndWait(JabRefDialogService.java:188) ~[main/:?]
  at org.jabref.FallbackExceptionHandler.lambda$uncaughtException$0(FallbackExceptionHandler.java:26) ~[main/:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$10(PlatformImpl.java:428) ~[javafx-graphics-14-win.jar:?]
  at java.security.AccessController.doPrivileged(AccessController.java:391) ~[?:?]
  at com.sun.javafx.application.PlatformImpl.lambda$runLater$11(PlatformImpl.java:427) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.InvokeLaterDispatcher$Future.run(InvokeLaterDispatcher.java:96) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication._runLoop(Native Method) ~[javafx-graphics-14-win.jar:?]
  at com.sun.glass.ui.win.WinApplication.lambda$runLoop$3(WinApplication.java:174) ~[javafx-graphics-14-win.jar:?]
  at java.lang.Thread.run(Thread.java:832) [?:?]  ```
</details>

[Siedlerchr]

Thanks for the report, I could reproduce it on Windows as well.
I guess it's because the dialog is shown outside the window bounds.

java.lang.IllegalStateException: The window has already been closed

[github-actions]

This issue has been inactive for half a year. Since JabRef is constantly evolving this issue may not be relevant any longer and it will be closed in two weeks if no further activity occurs.

As part of an effort to ensure that the JabRef team is focusing on important and valid issues, we would like to ask if you could update the issue if it still persists. This could be in the following form:

• If there has been a longer discussion, add a short summary of the most important points as a new comment (if not yet existing).
• Provide further steps or information on how to reproduce this issue.
• Upvote the initial post if you like to see it implemented soon. Votes are not the only metric that we use to determine the requests that are implemented, however, they do factor into our decision-making process.
• If all information is provided and still up-to-date, then just add a short comment that the issue is still relevant.

Thank you for your contribution!

[gassowska]

Bug still exists in version 5.2 on Windows 10, Ubuntu 20.04.1 LTS and Mac OS Catalina 10.15.7.