From f2a97e6e1180f4c93f630a2e93cd3f8d629de4bc Mon Sep 17 00:00:00 2001
From: Morgan Reschenberg <mreschenberg@mozilla.com>
Date: Thu, 15 Apr 2021 17:30:43 +0000
Subject: [PATCH] Bug 1538991: Verify parent exists  before calling
 ReorderEventTarget r=eeejay

Differential Revision: https://phabricator.services.mozilla.com/D112205
---
 accessible/base/NotificationController.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/accessible/base/NotificationController.cpp b/accessible/base/NotificationController.cpp
index 125c57df4ad2..5a54426dabb9 100644
--- a/accessible/base/NotificationController.cpp
+++ b/accessible/base/NotificationController.cpp
@@ -331,7 +331,7 @@ void NotificationController::CoalesceMutationEvents() {
         }
 
         LocalAccessible* parent = acc->LocalParent();
-        if (parent->ReorderEventTarget()) {
+        if (parent && parent->ReorderEventTarget()) {
           AccReorderEvent* reorder = downcast_accEvent(
               mMutationMap.GetEvent(parent, EventMap::ReorderEvent));