From 57ea3e3fe69669778a6a171a6c617866b9f9c410 Mon Sep 17 00:00:00 2001
From: James Teh <jteh@mozilla.com>
Date: Mon, 11 Apr 2022 23:19:16 +0000
Subject: [PATCH] Bug 1761469: BrowserHost::GetTopLevelDocAccessible: Return
 null if mRoot is null. r=eeejay

Differential Revision: https://phabricator.services.mozilla.com/D142186
---
 dom/ipc/BrowserHost.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dom/ipc/BrowserHost.cpp b/dom/ipc/BrowserHost.cpp
index 1f363ad7778d..3cf33d66b240 100644
--- a/dom/ipc/BrowserHost.cpp
+++ b/dom/ipc/BrowserHost.cpp
@@ -56,7 +56,7 @@ nsILoadContext* BrowserHost::GetLoadContext() const {
 bool BrowserHost::CanRecv() const { return mRoot && mRoot->CanRecv(); }
 
 a11y::DocAccessibleParent* BrowserHost::GetTopLevelDocAccessible() const {
-  return mRoot->GetTopLevelDocAccessible();
+  return mRoot ? mRoot->GetTopLevelDocAccessible() : nullptr;
 }
 
 void BrowserHost::LoadURL(nsDocShellLoadState* aLoadState) {