diff --git a/websocket-sharp/Server/WebSocketServiceHost`1.cs b/websocket-sharp/Server/WebSocketServiceHost`1.cs
index 24f634c1..b7422745 100644
--- a/websocket-sharp/Server/WebSocketServiceHost`1.cs
+++ b/websocket-sharp/Server/WebSocketServiceHost`1.cs
@@ -75,9 +75,9 @@ namespace WebSocketSharp.Server
       }
 
       set {
-        var msg = _sessions.State.CheckIfAvailable (true, false, false);
-        if (msg != null) {
-          _log.Error (msg);
+        string msg;
+        if (!canSet (out msg)) {
+          _log.Warn (msg);
           return;
         }