From 86e14309c30cc6dade2853b3f4cf6bd183d39b9a Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Mon, 5 Jun 2017 15:04:51 +0900
Subject: [PATCH] [Modify] Replace it

---
 websocket-sharp/Server/HttpServer.cs | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/websocket-sharp/Server/HttpServer.cs b/websocket-sharp/Server/HttpServer.cs
index 8d5fefe2..ffbb12bb 100644
--- a/websocket-sharp/Server/HttpServer.cs
+++ b/websocket-sharp/Server/HttpServer.cs
@@ -298,13 +298,20 @@ namespace WebSocketSharp.Server
       }
 
       set {
-        var msg = _state.CheckIfAvailable (true, false, false);
-        if (msg != null) {
-          _log.Error (msg);
+        string msg;
+        if (!canSet (out msg)) {
+          _log.Warn (msg);
           return;
         }
 
-        _listener.AuthenticationSchemes = value;
+        lock (_sync) {
+          if (!canSet (out msg)) {
+            _log.Warn (msg);
+            return;
+          }
+
+          _listener.AuthenticationSchemes = value;
+        }
       }
     }