From 0a31074f7789db45de5d4dd31638643df3e1c11d Mon Sep 17 00:00:00 2001
From: "timeless%mozdev.org" <timeless%mozdev.org>
Date: Fri, 1 Aug 2003 14:37:03 +0000
Subject: [PATCH] Bug 214049 null domwindow [@
 nsAccessibilityService::OnStateChange] r=aaronl sr=bz

---
 accessible/src/base/nsAccessibilityService.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/accessible/src/base/nsAccessibilityService.cpp b/accessible/src/base/nsAccessibilityService.cpp
index 33b3ab3f3ac..3de20984510 100644
--- a/accessible/src/base/nsAccessibilityService.cpp
+++ b/accessible/src/base/nsAccessibilityService.cpp
@@ -161,7 +161,9 @@ NS_IMETHODIMP nsAccessibilityService::OnStateChange(nsIWebProgress *aWebProgress
 
   nsCOMPtr<nsIDOMWindow> domWindow;
   aWebProgress->GetDOMWindow(getter_AddRefs(domWindow));
-  NS_ASSERTION(domWindow, "No dom window for nsIWebProgress::OnStateChange");
+  // Bug 214049 OnStateChange can come from non UI threads.
+  if (!domWindow)
+    return NS_OK;
 
   nsCOMPtr<nsIDOMDocument> domDoc;
   domWindow->GetDocument(getter_AddRefs(domDoc));