diff --git a/utils/dd_msg.py b/utils/dd_msg.py
index 00e01c9..a366e60 100644
--- a/utils/dd_msg.py
+++ b/utils/dd_msg.py
@@ -33,7 +33,7 @@ def get_sign():
 def ddsend_msg(msg):
 
     hash_msg = hmac.new(msg.encode('utf-8'), digestmod=hashlib.sha256).digest()
-    if hash_msg not in hash_msg:
+    if hash_msg not in msg_set:
         msg_set.add(hash_msg)
     else:
         return