Index: branches/RC/core/admin_templates/js/form_controls.js
===================================================================
diff -u -r10647 -r10672
--- branches/RC/core/admin_templates/js/form_controls.js	(.../form_controls.js)	(revision 10647)
+++ branches/RC/core/admin_templates/js/form_controls.js	(.../form_controls.js)	(revision 10672)
@@ -254,6 +254,7 @@
 }
 
 MultiInputControl.prototype.htmlspecialchars = function (string) {
+	string = string.toString();
 	string = string.replace(/&/g, '&');
 	string = string.replace(/</g, '&lt;');
 	string = string.replace(/>/g, '&gt;');