From 2f32d8b89f041cf6bd06af71e6e87f80a384eb4a Mon Sep 17 00:00:00 2001
From: "ginn.chen%sun.com"
 <ginn.chen%sun.com@18797224-902f-48f8-a5cc-f745e15eee43>
Date: Mon, 12 Mar 2007 05:41:31 +0000
Subject: [PATCH] Bug 373325 Firefox crash randomly [@
 nsAccessNode::GetRootAccessible] patch by Evan.Yan at sun.com
 r=aaronleventhal

git-svn-id: svn://10.0.0.236/trunk@221762 18797224-902f-48f8-a5cc-f745e15eee43
---
 mozilla/accessible/src/base/nsAccessNode.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mozilla/accessible/src/base/nsAccessNode.cpp b/mozilla/accessible/src/base/nsAccessNode.cpp
index c409a4639a3..0cf4d649dee 100755
--- a/mozilla/accessible/src/base/nsAccessNode.cpp
+++ b/mozilla/accessible/src/base/nsAccessNode.cpp
@@ -595,6 +595,9 @@ nsAccessNode::GetPresShellFor(nsIDOMNode *aNode)
 already_AddRefed<nsIDocShellTreeItem>
 nsAccessNode::GetDocShellTreeItemFor(nsIDOMNode *aStartNode)
 {
+  if (!aStartNode) {
+    return nsnull;
+  }
   nsCOMPtr<nsIDOMDocument> domDoc;
   aStartNode->GetOwnerDocument(getter_AddRefs(domDoc));
   nsCOMPtr<nsIDocument> doc(do_QueryInterface(domDoc));