From a20612a878835cb5c2b639efef1c1d47ee04e6a1 Mon Sep 17 00:00:00 2001
From: Morgan Reschenberg <mreschenberg@mozilla.com>
Date: Mon, 30 Sep 2019 16:23:30 +0000
Subject: [PATCH] Bug 1584465: Null check parent accessible before attribute
 check to cover root case. r=Jamie

Differential Revision: https://phabricator.services.mozilla.com/D47488

--HG--
extra : moz-landing-system : lando
---
 accessible/generic/HyperTextAccessible.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/accessible/generic/HyperTextAccessible.cpp b/accessible/generic/HyperTextAccessible.cpp
index 2ce7b005a522..9e5cc77622f1 100644
--- a/accessible/generic/HyperTextAccessible.cpp
+++ b/accessible/generic/HyperTextAccessible.cpp
@@ -300,7 +300,7 @@ uint32_t HyperTextAccessible::TransformOffset(Accessible* aDescendant,
       // bulleted lists here because PeekOffset returns the inner text node
       // for a list when it should return the list bullet.
       // We manually set the offset so the error doesn't propagate up.
-      if (offset == 0 && descendant->Parent()->IsHTMLListItem() &&
+      if (offset == 0 && parent && parent->IsHTMLListItem() &&
           descendant->PrevSibling() && descendant->PrevSibling()->GetFrame() &&
           descendant->PrevSibling()->GetFrame()->IsBulletFrame()) {
         offset = 0;