diff --git a/websocket-sharp/WebSocket.cs b/websocket-sharp/WebSocket.cs
index 4d0a0b0c..11cb0af0 100644
--- a/websocket-sharp/WebSocket.cs
+++ b/websocket-sharp/WebSocket.cs
@@ -2485,10 +2485,15 @@ namespace WebSocketSharp
     /// </param>
     public void CloseAsync (CloseStatusCode code)
     {
-      var msg = _readyState.CheckIfAvailable (true, true, false, false) ??
-                CheckCloseParameters (code, null, _client);
+      string msg;
+      if (!checkIfAvailable (true, true, false, false, out msg)) {
+        _logger.Error (msg);
+        error ("An error has occurred in closing the connection.", null);
 
-      if (msg != null) {
+        return;
+      }
+
+      if (!CheckParametersForClose (code, null, _client, out msg)) {
         _logger.Error (msg);
         error ("An error has occurred in closing the connection.", null);