From 9fe178710b3c217c4a7768aead066fdee46e24d0 Mon Sep 17 00:00:00 2001
From: sta <sta.blockhead@gmail.com>
Date: Thu, 31 Oct 2019 20:11:33 +0900
Subject: [PATCH] [Modify] Throw an exception

---
 websocket-sharp/Net/HttpListenerResponse.cs | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/websocket-sharp/Net/HttpListenerResponse.cs b/websocket-sharp/Net/HttpListenerResponse.cs
index 67826211..87be5a9b 100644
--- a/websocket-sharp/Net/HttpListenerResponse.cs
+++ b/websocket-sharp/Net/HttpListenerResponse.cs
@@ -548,7 +548,10 @@ namespace WebSocketSharp.Net
           throw new InvalidOperationException (msg);
         }
 
-        if (value == null || value.Length == 0) {
+        if (value == null)
+          throw new ArgumentNullException ("value");
+
+        if (value.Length == 0) {
           _statusDescription = _statusCode.GetStatusDescription ();
           return;
         }