bug gix

app/index/service/User.php

@@ -39,7 +39,11 @@ class User extends BaseService
      */
     public static function getCurrentLoginUserId()
     {
-        return Session::get(self::USER_ID);
+        $userId = Session::get(self::USER_ID);
+        if (empty($userId)){
+            return null;
+        }
+        return intval($userId);
     }
 
     /**