diff --git a/library/think/Session.php b/library/think/Session.php
index 9e317881..d9d927ec 100644
--- a/library/think/Session.php
+++ b/library/think/Session.php
@@ -246,6 +246,7 @@ class Session
     public static function start()
     {
         session_start();
+        self::$init = true;
     }
 
     /**