From 632ada5405f857373662a1087bf45e30fc15e0cb Mon Sep 17 00:00:00 2001
From: Simon Lydell <simon.lydell@gmail.com>
Date: Sat, 16 Jan 2016 14:54:42 +0100
Subject: [PATCH] Fix uncaught exception when opening the devtools

---
 extension/lib/utils.coffee | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/extension/lib/utils.coffee b/extension/lib/utils.coffee
index 10d939b..b9b49f9 100644
--- a/extension/lib/utils.coffee
+++ b/extension/lib/utils.coffee
@@ -249,7 +249,9 @@ containsDeep = (parent, element) ->
   parentWindow  = parent.ownerGlobal
   elementWindow = element.ownerGlobal
 
-  while elementWindow != parentWindow and elementWindow.top != elementWindow
+  # Owner windows might be missing when opening the devtools.
+  while elementWindow and parentWindow and
+        elementWindow != parentWindow and elementWindow.top != elementWindow
     element = elementWindow.frameElement
     elementWindow = element.ownerGlobal
 
-- 
2.39.3