diff --git a/src/client/dom/serviceworker.ts b/src/client/dom/serviceworker.ts
index a46e1ab..10164d4 100644
--- a/src/client/dom/serviceworker.ts
+++ b/src/client/dom/serviceworker.ts
@@ -52,7 +52,7 @@ export default function (client: ScramjetClient, self: Self) {
 
 	client.Trap("navigator.serviceWorker.controller", {
 		get(ctx) {
-			return registration.active;
+			return registration?.active;
 		},
 	});