diff --git a/websocket-sharp/Server/WebSocketServer.cs b/websocket-sharp/Server/WebSocketServer.cs
index 400ffcc6..df4e03c3 100644
--- a/websocket-sharp/Server/WebSocketServer.cs
+++ b/websocket-sharp/Server/WebSocketServer.cs
@@ -547,14 +547,14 @@ namespace WebSocketSharp.Server
 
       set {
         string msg;
-        if (!checkIfAvailable (true, false, false, true, out msg)) {
-          _logger.Error (msg);
+        if (!canSet (out msg)) {
+          _logger.Warn (msg);
           return;
         }
 
         lock (_sync) {
-          if (!checkIfAvailable (true, false, false, true, out msg)) {
-            _logger.Error (msg);
+          if (!canSet (out msg)) {
+            _logger.Warn (msg);
             return;
           }