diff --git a/src/backend/langflow/api/chat_manager.py b/src/backend/langflow/api/chat_manager.py
index 03c2f09b7..3636a94f3 100644
--- a/src/backend/langflow/api/chat_manager.py
+++ b/src/backend/langflow/api/chat_manager.py
@@ -90,7 +90,7 @@ class ChatManager:
         self.active_connections[client_id] = websocket
 
     def disconnect(self, client_id: str):
-        del self.active_connections[client_id]
+        self.active_connections.pop(client_id, None)
 
     async def send_message(self, client_id: str, message: str):
         websocket = self.active_connections[client_id]