From 9063520d89664caad179253690b6c02bca6c57eb Mon Sep 17 00:00:00 2001
From: Penar Musaraj <pmusaraj@gmail.com>
Date: Mon, 22 Feb 2021 14:11:20 -0500
Subject: [PATCH] FIX: Avoid Safari service worker error on back navigation
 (#12171)

---
 app/assets/javascripts/discourse/app/lib/push-notifications.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/app/assets/javascripts/discourse/app/lib/push-notifications.js b/app/assets/javascripts/discourse/app/lib/push-notifications.js
index b9ed09fe9b2..7d1012ba36e 100644
--- a/app/assets/javascripts/discourse/app/lib/push-notifications.js
+++ b/app/assets/javascripts/discourse/app/lib/push-notifications.js
@@ -53,7 +53,7 @@ export function isPushNotificationsSupported(mobileView) {
   if (
     !(
       "serviceWorker" in navigator &&
-      ServiceWorkerRegistration &&
+      typeof ServiceWorkerRegistration !== "undefined" &&
       typeof Notification !== "undefined" &&
       "showNotification" in ServiceWorkerRegistration.prototype &&
       "PushManager" in window