diff --git a/websocket-sharp/Server/WebSocketBehavior.cs b/websocket-sharp/Server/WebSocketBehavior.cs
index c424d32f..676a7fc9 100644
--- a/websocket-sharp/Server/WebSocketBehavior.cs
+++ b/websocket-sharp/Server/WebSocketBehavior.cs
@@ -633,6 +633,7 @@ namespace WebSocketSharp.Server
     {
       if (_websocket == null) {
         var msg = "The session has not started yet.";
+
         throw new InvalidOperationException (msg);
       }