diff --git a/js/pacosako_ui.js b/js/pacosako_ui.js
index 029a9c1..ae87164 100644
--- a/js/pacosako_ui.js
+++ b/js/pacosako_ui.js
@@ -631,11 +631,15 @@ $(function (){
    function closeNotifications(){
       try {
          navigator.serviceWorker.ready.then(function(registration){
-            registration.getNotifications({tag: 'notice'}).then(function(notifications){
-               for (const notification of notifications) {
-                  notification.close();
+            try {
+               if ('getNotifications' in registration) {
+                  registration.getNotifications({tag: 'notice'}).then(function(notifications){
+                     for (const notification of notifications) {
+                        notification.close();
+                     }
+                  });
                }
-            });
+            } catch (err) {}
          });
       } catch (err) {}
    }