diff --git a/web_src/js/features/notification.js b/web_src/js/features/notification.js
index 8b843e9806..0ea7f93c8d 100644
--- a/web_src/js/features/notification.js
+++ b/web_src/js/features/notification.js
@@ -52,6 +52,9 @@ export function initNotificationCount() {
       source.close();
       window.location.href = AppSubUrl;
     });
+    window.addEventListener('beforeunload', () => {
+      source.close();
+    });
     return;
   }