diff --git a/app/chain/site.py b/app/chain/site.py
index c4e0c813..cedaf657 100644
--- a/app/chain/site.py
+++ b/app/chain/site.py
@@ -89,7 +89,7 @@ class SiteChain(ChainBase):
                     ))
             # 低分享率警告
             if userdata.ratio and float(userdata.ratio) < 1 and not bool(
-                    re.search(r"(贵宾|VIP?)", userdata.user_level, re.IGNORECASE)):
+                    re.search(r"(贵宾|VIP?)", userdata.user_level or "", re.IGNORECASE)):
                 self.post_message(Notification(
                     mtype=NotificationType.SiteMessage,
                     title=f"【站点分享率低预警】",