From 66a657e50858d9edea47366858c5d23d57d8a456 Mon Sep 17 00:00:00 2001
From: Nika Layzell <nika@thelayzells.com>
Date: Tue, 7 Aug 2018 16:02:01 +0000
Subject: [PATCH] Bug 1479588 - Check mOwnerContent when starting new remote
 browser, r=bzbarsky

Differential Revision: https://phabricator.services.mozilla.com/D2524

--HG--
extra : moz-landing-system : lando
---
 dom/base/nsFrameLoader.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dom/base/nsFrameLoader.cpp b/dom/base/nsFrameLoader.cpp
index d6ffe41e0107..fcc15f3fb539 100644
--- a/dom/base/nsFrameLoader.cpp
+++ b/dom/base/nsFrameLoader.cpp
@@ -2562,6 +2562,10 @@ nsFrameLoader::TryRemoteBrowser()
 {
   NS_ASSERTION(!mRemoteBrowser, "TryRemoteBrowser called with a remote browser already?");
 
+  if (!mOwnerContent) {
+    return false;
+  }
+
   //XXXsmaug Per spec (2014/08/21) frameloader should not work in case the
   //         element isn't in document, only in shadow dom, but that will change
   //         https://www.w3.org/Bugs/Public/show_bug.cgi?id=26365#c0