Index: branches/RC/core/admin_templates/js/ajax.js
===================================================================
diff -u -N -r10536 -r10608
--- branches/RC/core/admin_templates/js/ajax.js	(.../ajax.js)	(revision 10536)
+++ branches/RC/core/admin_templates/js/ajax.js	(.../ajax.js)	(revision 10608)
@@ -252,6 +252,12 @@
 		return false;
 	}
 
+	if (isNaN(parseFloat($responce))) {
+		// error message received, otherwise $respoce should be number
+		alert($responce);
+		return ;
+	}
+
 	if ($object.showProgress($responce)) {
 		$object.Query();
 	}