From 499a99bce51e332abd531562254cf6a8131d16f6 Mon Sep 17 00:00:00 2001
From: Honza Bambas <honzab.moz@firemni.cz>
Date: Wed, 25 Apr 2012 14:50:20 +0200
Subject: [PATCH] Bug 700493 - Stop overlay load after document went away, r=bz

---
 content/xul/document/src/nsXULDocument.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/content/xul/document/src/nsXULDocument.cpp b/content/xul/document/src/nsXULDocument.cpp
index 67872f0c2a6..c295dfcbb8d 100644
--- a/content/xul/document/src/nsXULDocument.cpp
+++ b/content/xul/document/src/nsXULDocument.cpp
@@ -2762,6 +2762,11 @@ nsXULDocument::LoadOverlayInternal(nsIURI* aURI, bool aIsDynamic,
         // Not there. Initiate a load.
         PR_LOG(gXULLog, PR_LOG_DEBUG, ("xul: overlay was not cached"));
 
+        if (mIsGoingAway) {
+            PR_LOG(gXULLog, PR_LOG_DEBUG, ("xul: ...and document already destroyed"));
+            return NS_ERROR_NOT_AVAILABLE;
+        }
+
         // We'll set the right principal on the proto doc when we get
         // OnStartRequest from the parser, so just pass in a null principal for
         // now.