diff --git a/framework/base/router.class.php b/framework/base/router.class.php
index 9db231e3f4..84df7b4d85 100644
--- a/framework/base/router.class.php
+++ b/framework/base/router.class.php
@@ -1004,6 +1004,7 @@ class baseRouter
                     array($ztSessionHandler, "destroy"),
                     array($ztSessionHandler, "gc")
                 );
+                register_shutdown_function('session_write_close');
             }
         }
 
@@ -3167,7 +3168,6 @@ class ztSessionHandler
     {
         $this->tagID = $tagID;
         ini_set('session.save_handler', 'files');
-        register_shutdown_function('session_write_close');
     }
 
     /**