diff --git a/server/sio/MMVC_SocketIOServer.py b/server/sio/MMVC_SocketIOServer.py
index 9f7c0267..9f168515 100644
--- a/server/sio/MMVC_SocketIOServer.py
+++ b/server/sio/MMVC_SocketIOServer.py
@@ -9,7 +9,7 @@ class MMVC_SocketIOServer:
 
     @classmethod
     def get_instance(cls, voiceChangerManager: VoiceChangerManager):
-        if not hasattr(cls, "_instance"):
+        if cls._instance is None:
             sio = socketio.AsyncServer(async_mode="asgi", cors_allowed_origins="*")
             namespace = MMVC_Namespace.get_instance(voiceChangerManager)
             sio.register_namespace(namespace)