From 0d48750803fdc49129e46a20d8eeb535e263d649 Mon Sep 17 00:00:00 2001
From: Alexander Surkov <surkov.alexander@gmail.com>
Date: Tue, 10 Nov 2009 14:12:15 +0800
Subject: [PATCH] Bug 492961 - Crash [@
 nsHTMLTableHeaderAccessible::GetRoleInternal(unsigned int*) ], r=marcoz,
 davidb

---
 accessible/src/html/nsHTMLTableAccessible.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/accessible/src/html/nsHTMLTableAccessible.cpp b/accessible/src/html/nsHTMLTableAccessible.cpp
index 0b1aeb13eb06..6ebc01a2e313 100644
--- a/accessible/src/html/nsHTMLTableAccessible.cpp
+++ b/accessible/src/html/nsHTMLTableAccessible.cpp
@@ -403,6 +403,8 @@ nsHTMLTableHeaderCellAccessible::GetRoleInternal(PRUint32 *aRole)
   // Assume it's columnheader if there are headers in siblings, oterwise
   // rowheader.
   nsIContent* parent = content->GetParent();
+  NS_ENSURE_STATE(parent);
+
   PRInt32 indexInParent = parent->IndexOf(content);
 
   for (PRInt32 idx = indexInParent - 1; idx >= 0; idx--) {