diff --git a/websocket-sharp/Server/WebSocketServiceManager.cs b/websocket-sharp/Server/WebSocketServiceManager.cs
index 23822958..597b6851 100644
--- a/websocket-sharp/Server/WebSocketServiceManager.cs
+++ b/websocket-sharp/Server/WebSocketServiceManager.cs
@@ -472,6 +472,7 @@ namespace WebSocketSharp.Server
 
       lock (_sync) {
         hosts = _hosts.Values.ToList ();
+
         _hosts.Clear ();
       }