From fb36de613858ba36421dafeb1019ab9463e9cb6f Mon Sep 17 00:00:00 2001
From: Colton Padden <colton.padden@fastmail.com>
Date: Thu, 30 Dec 2021 11:40:18 -0500
Subject: [PATCH] validate footer element exists before applying style

Signed-off-by: Colton Padden <colton.padden@fastmail.com>
---
 plugins/techdocs/src/reader/components/Reader.tsx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/plugins/techdocs/src/reader/components/Reader.tsx b/plugins/techdocs/src/reader/components/Reader.tsx
index b26139d593..595ce2d069 100644
--- a/plugins/techdocs/src/reader/components/Reader.tsx
+++ b/plugins/techdocs/src/reader/components/Reader.tsx
@@ -171,7 +171,9 @@ export const useTechDocsReaderDom = (entityRef: EntityName): Element | null => {
   const updateFooterWidth = useCallback(() => {
     if (!dom) return;
     const footer = dom.querySelector('.md-footer') as HTMLElement;
-    footer.style.width = `${dom.getBoundingClientRect().width}px`;
+    if (footer) {
+      footer.style.width = `${dom.getBoundingClientRect().width}px`;
+    }
   }, [dom]);
 
   useEffect(() => {