From 46c84a406d1e743f64e9da4d3b45bf0c52855b7b Mon Sep 17 00:00:00 2001
From: Kris Maglione <maglione.k@gmail.com>
Date: Thu, 4 Feb 2016 13:54:38 -0800
Subject: [PATCH] Bug 1245671: Fix Assert.rejects on release builds with DOM
 promises. r=markh

---
 testing/modules/Assert.jsm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/testing/modules/Assert.jsm b/testing/modules/Assert.jsm
index d5a043c80d1..db2747aa6cf 100644
--- a/testing/modules/Assert.jsm
+++ b/testing/modules/Assert.jsm
@@ -109,7 +109,7 @@ Assert.AssertionError = function(options) {
   let stack = Components.stack;
   do {
     stack = stack.asyncCaller || stack.caller;
-  } while(stack.filename && stack.filename.includes("Assert.jsm"))
+  } while(stack && stack.filename && stack.filename.includes("Assert.jsm"))
   this.stack = stack;
 };