From e0b8adbb9894d41435fdb183cfa4649f2b8b6e7e Mon Sep 17 00:00:00 2001
From: Philipp Imhof <52650214+PhilippImhof@users.noreply.github.com>
Date: Fri, 3 Nov 2023 21:51:03 +0100
Subject: [PATCH] MDL-74378 mod_quiz: make sure timer is initialized

---
 mod/quiz/module.js | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/mod/quiz/module.js b/mod/quiz/module.js
index db7d3eda872..9078fcbac43 100644
--- a/mod/quiz/module.js
+++ b/mod/quiz/module.js
@@ -149,6 +149,13 @@ M.mod_quiz.timer = {
     updateEndTime: function(timeleft) {
         var newtimeleft = new Date().getTime() + timeleft * 1000;
 
+        // Timer might not have been initialized yet. We initialize it with
+        // preview = 0, because it's better to take a preview for a real quiz
+        // than to take a real quiz for a preview.
+        if (M.mod_quiz.timer.Y === null) {
+            M.mod_quiz.timer.init(window.Y, timeleft, 0);
+        }
+
         // Only update if change is greater than the threshold, so the
         // time doesn't bounce around unnecessarily.
         if (Math.abs(newtimeleft - M.mod_quiz.timer.endtime) > M.mod_quiz.timer.threshold) {