From ae7b43a688ca997f80a076853bb9295140e75d93 Mon Sep 17 00:00:00 2001
From: "asqueella%gmail.com" <asqueella%gmail.com>
Date: Wed, 7 Mar 2007 19:54:31 +0000
Subject: [PATCH] Bug 367704 - crash [@ nsAccessible::GetPreviousSibling] on a
 nsRootAccessible p=Mook <mook.moz+mozbz@gmail.com> r=aaronleventhal

---
 accessible/src/base/nsAccessible.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/accessible/src/base/nsAccessible.cpp b/accessible/src/base/nsAccessible.cpp
index 205c4fa2a2f8..c9b3e5a8ee19 100644
--- a/accessible/src/base/nsAccessible.cpp
+++ b/accessible/src/base/nsAccessible.cpp
@@ -594,7 +594,7 @@ NS_IMETHODIMP nsAccessible::GetPreviousSibling(nsIAccessible * *aPreviousSibling
   }
 
   nsCOMPtr<nsIAccessible> parent;
-  if (NS_FAILED(GetParent(getter_AddRefs(parent)))) {
+  if (NS_FAILED(GetParent(getter_AddRefs(parent))) || !parent) {
     return NS_ERROR_FAILURE;
   }