diff --git a/jerry-core/ecma/base/ecma-helpers-string.c b/jerry-core/ecma/base/ecma-helpers-string.c
index 0c4f2a7972..41a11120c7 100644
--- a/jerry-core/ecma/base/ecma-helpers-string.c
+++ b/jerry-core/ecma/base/ecma-helpers-string.c
@@ -2052,7 +2052,7 @@ ecma_string_get_utf8_length (const ecma_string_t *string_p) /**< ecma-string */
         return (ecma_length_t) (long_string_p->long_utf8_string_length);
       }
 
-      return lit_get_utf8_length_of_cesu8_string ((const lit_utf8_byte_t *) (string_p + 1),
+      return lit_get_utf8_length_of_cesu8_string ((const lit_utf8_byte_t *) (long_string_p + 1),
                                                   (lit_utf8_size_t) string_p->u.long_utf8_string_size);
     }
     default:
diff --git a/tests/jerry/regression-test-issue-2451.js b/tests/jerry/regression-test-issue-2451.js
new file mode 100644
index 0000000000..026db7a00b
--- /dev/null
+++ b/tests/jerry/regression-test-issue-2451.js
@@ -0,0 +1,19 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var src = "var a = 0; while(a) { switch(a) {" ;
+for (var i = 0; i < 4000; i++)
+    src += "-Infinity" + i + "\u00a0\u00a01.2e3";
+src += "\udc00%f0%90%80%80\udc00";
+print(src);
diff --git a/tests/jerry/regression-test-issue-2452.js b/tests/jerry/regression-test-issue-2452.js
new file mode 100644
index 0000000000..40927d5843
--- /dev/null
+++ b/tests/jerry/regression-test-issue-2452.js
@@ -0,0 +1,19 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var src = "";
+for (var i = 0; i < 4000; i++)
+  src += "\udc00%f0%90%80%80\udc00";
+src += "} }";
+print(src);
diff --git a/tests/jerry/regression-test-issue-2453.js b/tests/jerry/regression-test-issue-2453.js
new file mode 100644
index 0000000000..994a206a82
--- /dev/null
+++ b/tests/jerry/regression-test-issue-2453.js
@@ -0,0 +1,20 @@
+// Copyright JS Foundation and other contributors, http://js.foundation
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+var src = "";
+for (var i = 0; i < 4000; i++)
+  src += 4 + i + ": a += a += a; break; ";
+  src += "\𝔺\
+\
";
+print(src);