From c647be92b3f370d71e4ce1257346c4c7fc95de7e Mon Sep 17 00:00:00 2001
From: James Coglan <jcoglan@gmail.com>
Date: Fri, 29 Jul 2016 06:51:32 +0100
Subject: [PATCH] Return null from ws.create() if the browser does not support
 WebSocket. This prevents crashes in IE <10.

---
 src/util/websocket/browser_websocket.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/util/websocket/browser_websocket.js b/src/util/websocket/browser_websocket.js
index c7e525f0..9a7de8ce 100644
--- a/src/util/websocket/browser_websocket.js
+++ b/src/util/websocket/browser_websocket.js
@@ -4,6 +4,7 @@ var WS = global.MozWebSocket || global.WebSocket;
 
 module.exports = {
   create: function(url, protocols, options) {
+    if (typeof WS !== 'function') return null;
     return new WS(url);
   }
 };