diff --git a/websocket-sharp/Server/WebSocketServer.cs b/websocket-sharp/Server/WebSocketServer.cs
index d3fe45b9..55a55f5c 100644
--- a/websocket-sharp/Server/WebSocketServer.cs
+++ b/websocket-sharp/Server/WebSocketServer.cs
@@ -986,6 +986,7 @@ namespace WebSocketSharp.Server
       }
       catch (Exception ex) {
         var msg = "The underlying listener has failed to stop.";
+
         throw new InvalidOperationException (msg, ex);
       }