From af28af9f85dbdd09a9c11e33cab99f09a2699337 Mon Sep 17 00:00:00 2001
From: roytam1 <roytam@gmail.com>
Date: Mon, 20 Mar 2023 07:34:56 +0800
Subject: [PATCH] follow-up rev 24572438, `targetInKnownToBeHandledScope` can
 be null

---
 dom/base/FragmentOrElement.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/dom/base/FragmentOrElement.cpp b/dom/base/FragmentOrElement.cpp
index 38be731811..ce7f662eb9 100644
--- a/dom/base/FragmentOrElement.cpp
+++ b/dom/base/FragmentOrElement.cpp
@@ -1022,7 +1022,7 @@ nsIContent::GetEventTargetParent(EventChainPreVisitor& aVisitor)
             nsContentUtils::Retarget(relatedTargetAsNode, this);
           nsCOMPtr<nsINode> targetInKnownToBeHandledScope =
             FindChromeAccessOnlySubtreeOwner(aVisitor.mTargetInKnownToBeHandledScope);
-          if (nsContentUtils::ContentIsShadowIncludingDescendantOf(
+          if (targetInKnownToBeHandledScope && nsContentUtils::ContentIsShadowIncludingDescendantOf(
                 this, targetInKnownToBeHandledScope->SubtreeRoot())) {
             // Part of step 11.4.
             // "If target's root is a shadow-including inclusive ancestor of