From 85b9daedb830920d6aaf99a50bd06bf8b5ee011b Mon Sep 17 00:00:00 2001
From: Oliver Eyton-Williams <ojeytonwilliams@gmail.com>
Date: Thu, 23 Dec 2021 14:34:26 +0000
Subject: [PATCH] fix(client): handle challenge resets with hidden preview
 (#44570)

---
 client/src/templates/Challenges/utils/frame.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/client/src/templates/Challenges/utils/frame.js b/client/src/templates/Challenges/utils/frame.js
index 9d612dea0f..def4a19df4 100644
--- a/client/src/templates/Challenges/utils/frame.js
+++ b/client/src/templates/Challenges/utils/frame.js
@@ -91,7 +91,8 @@ const mountFrame =
   };
 
 const buildProxyConsole = proxyLogger => ctx => {
-  if (proxyLogger) {
+  // window does not exist if the preview is hidden, so we have to check.
+  if (proxyLogger && ctx?.window) {
     const oldLog = ctx.window.console.log.bind(ctx.window.console);
     ctx.window.console.log = function proxyConsole(...args) {
       proxyLogger(args.map(arg => format(arg)).join(' '));