From c313056e68d29ab357f9e99a663bf4520e758d63 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Wed, 19 Dec 2018 21:49:57 +0900
Subject: [PATCH] [Modify] Add a check

---
 websocket-sharp/Net/HttpUtility.cs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/websocket-sharp/Net/HttpUtility.cs b/websocket-sharp/Net/HttpUtility.cs
index de4dcdf4..9b044436 100644
--- a/websocket-sharp/Net/HttpUtility.cs
+++ b/websocket-sharp/Net/HttpUtility.cs
@@ -907,6 +907,9 @@ namespace WebSocketSharp.Net
       if (output == null)
         throw new ArgumentNullException ("output");
 
+      if (s.Length == 0)
+        return;
+
       output.Write (HtmlDecode (s));
     }