From 84bea357c879090a833b096c00be5c4318d48c4f Mon Sep 17 00:00:00 2001
From: Stephen Blott
Date: Tue, 5 Apr 2016 06:50:06 +0100
Subject: Check for document.activeElement.

When DomUtils.isFocusable() is called from GrabBackFocus-pushState-monitor
it is possible that document.activeElement is not ready.  So we should
check.

Here, we check in DomUtils.isFocusable(), because we always need element
to be defined for this test, not just in GrabBackFocus-pushState-monitor.
---
 lib/dom_utils.coffee | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/dom_utils.coffee b/lib/dom_utils.coffee
index 9a6c1b09..a57cbedb 100644
--- a/lib/dom_utils.coffee
+++ b/lib/dom_utils.coffee
@@ -192,7 +192,7 @@ DomUtils =
     element.nodeName?.toLowerCase() in ["embed", "object"]
 
   isFocusable: (element) ->
-    @isEditable(element) or @isEmbed element
+    element and (@isEditable(element) or @isEmbed element)
 
   isDOMDescendant: (parent, child) ->
     node = child
-- 
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