From 94367706206f44a7f7f23bd1ce11db981c7c547d Mon Sep 17 00:00:00 2001
From: Chris Deery <3932645+cdeery@users.noreply.github.com>
Date: Thu, 17 Mar 2022 14:47:19 -0400
Subject: [PATCH] fix: improve Guard for Iframe resize (#875)

Fix line that was causing JS errors when it was called in a context without a valid document.
---
 src/course-home/outline-tab/LmsHtmlFragment.jsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/course-home/outline-tab/LmsHtmlFragment.jsx b/src/course-home/outline-tab/LmsHtmlFragment.jsx
index d2db4071..5385d386 100644
--- a/src/course-home/outline-tab/LmsHtmlFragment.jsx
+++ b/src/course-home/outline-tab/LmsHtmlFragment.jsx
@@ -28,7 +28,7 @@ export default function LmsHtmlFragment({
 
   const iframe = useRef(null);
   function resetIframeHeight() {
-    if (iframe.current) {
+    if (iframe?.current?.contentWindow?.document?.body) {
       iframe.current.height = iframe.current.contentWindow.document.body.scrollHeight;
     }
   }