From aea1a4f0858f796d3439329c7f1aa154000ffcad Mon Sep 17 00:00:00 2001
From: Lescaudron Mathieu <mathieu.lescaudron@gmail.com>
Date: Fri, 14 Oct 2016 17:36:25 +0200
Subject: [PATCH] Avoid _bound of undefined using trackjs and ionic

---
 assets/zone.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/assets/zone.js b/assets/zone.js
index a39edce..7a9c28c 100644
--- a/assets/zone.js
+++ b/assets/zone.js
@@ -944,7 +944,7 @@ function patchEventTargetMethods(obj, thing) {
 
   var removeDelegate = obj.removeEventListener;
   obj.removeEventListener = function (eventName, fn) {
-    if(arguments[1]._bound && arguments[1]._bound[eventName]) {
+    if(arguments[1] && arguments[1]._bound && arguments[1]._bound[eventName]) {
       var _bound = arguments[1]._bound;
       arguments[1] = _bound[eventName];
       delete _bound[eventName];