diff --git a/MultiServer.py b/MultiServer.py
index a96131d5..095cb36b 100644
--- a/MultiServer.py
+++ b/MultiServer.py
@@ -135,6 +135,7 @@ def get_saving_second(seed_name: str, interval: int = 60) -> int:
 
 class Client(Endpoint):
     __slots__ = (
+        "__weakref__",
         "version",
         "auth",
         "team",