diff --git a/islands/RegisterServiceWorker.tsx b/islands/RegisterServiceWorker.tsx
index df34f52..3c4eaf5 100644
--- a/islands/RegisterServiceWorker.tsx
+++ b/islands/RegisterServiceWorker.tsx
@@ -34,6 +34,7 @@ export default function RegisterServiceWorker() {
 			}
 
 			try {
+				if (registration.active === null) return
 				const subscription = await getSubscription()
 				await requestApi('webpush/subscription', 'POST', subscription)
 			} catch (cause) {