diff --git a/app/api/v1/auth.py b/app/api/v1/auth.py
index 36ba926..4e5374a 100644
--- a/app/api/v1/auth.py
+++ b/app/api/v1/auth.py
@@ -103,7 +103,7 @@ async def wechat_login(
             user = existing_user
             logger.info(f"现有用户登录: id={user.id}")
 
-            if user.user_code is None:
+            if not user.user_code:
                 user.user_code = generate_user_code()
                 user.nickname = f"搭友{user.user_code}"
                 user.avatar = settings.DEFAULT_AVATAR