diff --git a/src/dinner.py b/src/dinner.py
index d7358ae..fa37830 100644
--- a/src/dinner.py
+++ b/src/dinner.py
@@ -93,7 +93,7 @@ def dinner_update():
     print(user_agent_string)
     if not is_mobile_request(user_agent_string):
         abort(403)
-    if check_roll() != -1:
+    if check_roll() == -1:
         return make_response(json.dumps(dict(code=-1, data="来晚了，提交失败")))
     user_menu = request.args.get('value').strip()
     nickname = request.args.get('nickname').strip()