Index: branches/5.2.x/core/units/users/users_event_handler.php
===================================================================
--- branches/5.2.x/core/units/users/users_event_handler.php
+++ branches/5.2.x/core/units/users/users_event_handler.php
@@ -247,7 +247,9 @@
 				return ;
 			}
 
-			$this->Application->Session->DeleteExpired();
+			/** @var SessionStorage $session_storage */
+			$session_storage = $this->Application->recallObject('SessionStorage');
+			$session_storage->DeleteExpired();
 		}
 
 		/**