diff --git a/websocket-sharp/Server/WebSocketBehavior.cs b/websocket-sharp/Server/WebSocketBehavior.cs
index b45d0ffa..430c392c 100644
--- a/websocket-sharp/Server/WebSocketBehavior.cs
+++ b/websocket-sharp/Server/WebSocketBehavior.cs
@@ -900,6 +900,7 @@ namespace WebSocketSharp.Server
     {
       if (_websocket == null) {
         var msg = "The current state of the connection is not Open.";
+
         throw new InvalidOperationException (msg);
       }