Index: branches/5.2.x/core/units/helpers/ajax_form_helper.php
===================================================================
diff -u -N -r15776 -r16003
--- branches/5.2.x/core/units/helpers/ajax_form_helper.php	(.../ajax_form_helper.php)	(revision 15776)
+++ branches/5.2.x/core/units/helpers/ajax_form_helper.php	(.../ajax_form_helper.php)	(revision 16003)
@@ -134,6 +134,10 @@
 			}
 			else {
 				if ( !isset($params['redirect_to']) && ($event->redirect === true || strlen($event->redirect) > 0) ) {
+					if ( $event->redirect === true ) {
+						$event->redirect = '';
+					}
+
 					$redirect_to = $this->Application->HREF($event->redirect, '', $event->getRedirectParams(), $event->redirectScript);
 
 					// is used from JavaScript / redirecting, so any "&" could break it