From d143da6750863537d86d57e2c469fad51f72dfd8 Mon Sep 17 00:00:00 2001
From: Morgan Rae Reschenberg <mreschenberg@mozilla.com>
Date: Tue, 13 Sep 2022 19:57:53 +0000
Subject: [PATCH] Bug 1788547: Null check table acc exists before firing
 styling changed event, add assert for debugging r=Jamie

Differential Revision: https://phabricator.services.mozilla.com/D156987
---
 accessible/base/nsAccessibilityService.cpp | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/accessible/base/nsAccessibilityService.cpp b/accessible/base/nsAccessibilityService.cpp
index e07de2e4d5f7..f99cacfc928c 100644
--- a/accessible/base/nsAccessibilityService.cpp
+++ b/accessible/base/nsAccessibilityService.cpp
@@ -568,10 +568,11 @@ void nsAccessibilityService::TableLayoutGuessMaybeChanged(
     PresShell* aPresShell, nsIContent* aContent) {
   if (DocAccessible* document = GetDocAccessible(aPresShell)) {
     if (LocalAccessible* acc = document->GetAccessible(aContent)) {
-      LocalAccessible* table = nsAccUtils::TableFor(acc);
-      document->FireDelayedEvent(
-          nsIAccessibleEvent::EVENT_TABLE_STYLING_CHANGED, table);
-      document->QueueCacheUpdate(table, CacheDomain::Table);
+      if (LocalAccessible* table = nsAccUtils::TableFor(acc)) {
+        document->FireDelayedEvent(
+            nsIAccessibleEvent::EVENT_TABLE_STYLING_CHANGED, table);
+        document->QueueCacheUpdate(table, CacheDomain::Table);
+      }
     }
   }
 }