diff --git a/UI/WebServerResources/HTMLElement.js b/UI/WebServerResources/HTMLElement.js
index 354fa22ee..c49ac642a 100644
--- a/UI/WebServerResources/HTMLElement.js
+++ b/UI/WebServerResources/HTMLElement.js
@@ -200,7 +200,7 @@ Element.addMethods(
 			element.removeClassName('_selected');
 
 			var parent = element.up();
-			if (parent.selectedElements)
+			if (parent && parent.selectedElements)
 				parent.selectedElements = parent.selectedElements.without(element);
 	},