Index: branches/RC/core/admin_templates/js/forms.js
===================================================================
diff -u -r10579 -r10832
--- branches/RC/core/admin_templates/js/forms.js	(.../forms.js)	(revision 10579)
+++ branches/RC/core/admin_templates/js/forms.js	(.../forms.js)	(revision 10832)
@@ -129,9 +129,9 @@
 			// if we got here, it means that we are closing window ilegally (through OS interace X button)
 //			alert('closing window');
 			// we need to clear temp tables then
-
-			window.opener.WatchClosing(window, _DropTempUrl);
-
+			if (window.opener) {
+				window.opener.WatchClosing(window, _DropTempUrl);
+			}
 		}
 	});