From 66f16dde502f2d4c32b3ac4f346e0c88715e32af Mon Sep 17 00:00:00 2001
From: YUKI Hiroshi <shimoda@clear-code.com>
Date: Wed, 19 Nov 2014 12:25:56 +0900
Subject: [PATCH] Accept null input by getTabFromFrame().

This suppresses a crash error reported on https://bugzilla.mozilla.org/show_bug.cgi?id=1098688
---
 modules/base.js | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/modules/base.js b/modules/base.js
index a38cceae..8849492b 100644
--- a/modules/base.js
+++ b/modules/base.js
@@ -1112,6 +1112,8 @@ var TreeStyleTabBase = inherit(TreeStyleTabConstants, {
 	// this is used only for obsolete API call on non-E10S windows
 	getTabFromFrame : function TSTBase_getTabFromFrame(aFrame, aTabBrowser) 
 	{
+		if (!aFrame)
+			return null;
 		var b = aTabBrowser || this.browser;
 		var top = aFrame.top;
 		var tabs = this.getAllTabs(b);