Bug 492961 - Crash [@ nsHTMLTableHeaderAccessible::GetRoleInternal(unsigned int*) ], r=marcoz, davidb

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--) {