diff --git a/src/hooks/useNotificationToken.ts b/src/hooks/useNotificationToken.ts
index 8b430a0..6227419 100644
--- a/src/hooks/useNotificationToken.ts
+++ b/src/hooks/useNotificationToken.ts
@@ -8,6 +8,7 @@ export const useNotificationToken = () => {
     if (!isNotificationSupport()) return;
     getFirebaseToken()
       .then(token => {
+        if (!token) return;
         setToken(token);
       })
       .catch(() => {});
diff --git a/src/utils/firebase-frontend.ts b/src/utils/firebase-frontend.ts
index d3ea527..017056f 100644
--- a/src/utils/firebase-frontend.ts
+++ b/src/utils/firebase-frontend.ts
@@ -20,9 +20,9 @@ export const getFirebaseApp = () => {
   }
   return firebase.app;
 };
-// getAnalytics(app);
 
 export const initServiceWorker = async () => {
+  if (!navigator.serviceWorker) return;
   if (!firebase.registeration) {
     firebase.registeration = await navigator.serviceWorker.register('/sw.js', {
       scope: '/',
@@ -41,6 +41,7 @@ export const getFirebaseMessaging = () => {
 
 export async function getFirebaseToken() {
   const registeration = await initServiceWorker(); 
+  if (!registeration) return '';
   await registeration.update();
   const token = await getToken(getFirebaseMessaging(), { 
     vapidKey: VAPI_PUBLIC_KEY,