diff --git a/django/notice/consumers.py b/django/notice/consumers.py
index 7b2b530..e01af2a 100644
--- a/django/notice/consumers.py
+++ b/django/notice/consumers.py
@@ -89,5 +89,6 @@ class NoticeConsumer(WebsocketConsumer):
         notice_manager.add(self)
 
     def disconnect(self, code):
-        notice_manager.remove(self)
+        if self.scope['user'].is_authenticated:
+            notice_manager.remove(self)
         super().disconnect(code)