diff --git a/framework/base/router.class.php b/framework/base/router.class.php
index 7364c41fc7..2dec604d3a 100644
--- a/framework/base/router.class.php
+++ b/framework/base/router.class.php
@@ -882,7 +882,7 @@ class baseRouter
         else
         {
             $module = $this->rawModule;
-            $this->openApp = $this->lang->navGroup->$module;
+            $this->openApp = isset($this->lang->navGroup->$module) ? $this->lang->navGroup->$module : 'my';
         }
     }