diff --git a/packages/backend/src/queue/processors/inbox.ts b/packages/backend/src/queue/processors/inbox.ts
index b319fbd38..09a69b25c 100644
--- a/packages/backend/src/queue/processors/inbox.ts
+++ b/packages/backend/src/queue/processors/inbox.ts
@@ -35,8 +35,11 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 	info["@context"] = undefined;
 	logger.debug(JSON.stringify(info, null, 2));
 
-	if (!signature?.keyId) return `Invalid signature: ${signature}`;
-
+	if (!signature?.keyId) {
+		const err = `Invalid signature: ${signature}`;
+		job.moveToFailed({message: err});
+		return err;
+	}
 	//#endregion
 	const host = toPuny(new URL(signature.keyId).hostname);