validate footer element exists before applying style

Signed-off-by: Colton Padden <colton.padden@fastmail.com>
2021-12-30 11:40:18 -05:00
parent e0271456d8
commit fb36de6138
1 changed files with 3 additions and 1 deletions
@@ -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(() => {