Index: /CKEditor/branches/versions/3.5.x/_source/plugins/clipboard/plugin.js
===================================================================
--- /CKEditor/branches/versions/3.5.x/_source/plugins/clipboard/plugin.js	(revision 6171)
+++ /CKEditor/branches/versions/3.5.x/_source/plugins/clipboard/plugin.js	(revision 6172)
@@ -50,5 +50,5 @@
 				{
 					// Other browsers throw an error if the command is disabled.
-					return editor.document.$.execCommand( type );
+					return editor.document.$.execCommand( type, false, null );
 				}
 				catch( e )