diff --git a/src/offscreen-documents/worker/worker.ts b/src/offscreen-documents/worker/worker.ts
index b54255e4..76052713 100644
--- a/src/offscreen-documents/worker/worker.ts
+++ b/src/offscreen-documents/worker/worker.ts
@@ -52,4 +52,6 @@ browser.runtime.onMessage.addListener((rawMessage) => {
 			return Promise.resolve();
 		}
 	}
+
+	return;
 });