From ef71d52ec0d63e926af2f75de33774158ab33695 Mon Sep 17 00:00:00 2001
From: Kevin Ansfield <kevin@lookingsideways.co.uk>
Date: Thu, 24 Nov 2022 12:51:56 +0000
Subject: [PATCH] Fixed `Cannot read properties of null (reading
 'offsetHeight')` errors in markdown card

closes sentry ADMIN-CAV

- the mobile nav element is not always displayed so we should assume we can read it's `offsetHeight` property
---
 .../lib/koenig-editor/addon/components/koenig-card-markdown.js  | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ghost/admin/lib/koenig-editor/addon/components/koenig-card-markdown.js b/ghost/admin/lib/koenig-editor/addon/components/koenig-card-markdown.js
index f346776ad0..7f1e88b681 100644
--- a/ghost/admin/lib/koenig-editor/addon/components/koenig-card-markdown.js
+++ b/ghost/admin/lib/koenig-editor/addon/components/koenig-card-markdown.js
@@ -203,7 +203,7 @@ export default class KoenigCardMarkdown extends Component {
         if (style === fixedBottom) {
             let mobileNav = document.querySelector('.gh-mobile-nav-bar');
 
-            if (mobileNav.offsetHeight) {
+            if (mobileNav?.offsetHeight) {
                 style = `${style}; bottom: ${mobileNav.offsetHeight}px`;
             }
         }