diff --git a/src/angular-sortable-view.js b/src/angular-sortable-view.js
index 76e08bc..554cbbb 100644
--- a/src/angular-sortable-view.js
+++ b/src/angular-sortable-view.js
@@ -88,6 +88,7 @@
 						return getSortableElements(mapKey);
 					}, function(collection){
 						isGrid = false;
+						if (!collection) return;
 						var array = collection.filter(function(item){
 							return !item.container;
 						}).map(function(item){