From 8aedfa8cc81ef96526771aa3909b52d986d9fac2 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Wed, 26 Sep 2018 20:34:32 +0900
Subject: [PATCH] [Modify] Throw exception

---
 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 97d73dc2..7d1b4001 100644
--- a/websocket-sharp/Net/HttpUtility.cs
+++ b/websocket-sharp/Net/HttpUtility.cs
@@ -846,6 +846,9 @@ namespace WebSocketSharp.Net
 
     public static void HtmlAttributeEncode (string s, TextWriter output)
     {
+      if (s == null)
+        throw new ArgumentNullException ("s");
+
       if (output == null)
         throw new ArgumentNullException ("output");