Index: branches/1.0.x/inc/js/form_manager.js
===================================================================
diff -u -N -r14806 -r14907
--- branches/1.0.x/inc/js/form_manager.js	(.../form_manager.js)	(revision 14806)
+++ branches/1.0.x/inc/js/form_manager.js	(.../form_manager.js)	(revision 14907)
@@ -363,6 +363,10 @@
 };
 
 FormManager.form_param = function ($prefix, $param, $value) {
+	if ( this.forms[$prefix] === undefined ) {
+		return '';
+	}
+
 	if ($value === undefined) {
 		return this.forms[$prefix][$param];
 	}