From c063619f87d140fe0abf82da73f10d1d019fd24c Mon Sep 17 00:00:00 2001
From: Stephen Blott
Date: Tue, 5 May 2015 08:47:29 +0100
Subject: Fix unregisterFrame logic.

---
 background_scripts/main.coffee | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'background_scripts')

diff --git a/background_scripts/main.coffee b/background_scripts/main.coffee
index 1b965314..ffed4d2d 100644
--- a/background_scripts/main.coffee
+++ b/background_scripts/main.coffee
@@ -602,7 +602,8 @@ unregisterFrame = (request, sender) ->
   # When a tab is closing, Chrome sometimes passes messages without sender.tab.  Therefore, we guard against
   # this.
   tabId = sender.tab?.id
-  if tabId? and frameIdsForTab[tabId]?
+  return unless tabId?
+  if frameIdsForTab[tabId]?
     if request.tab_is_closing
       updateOpenTabs sender.tab, true
     else
-- 
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