diff --git a/src/common/event-bus/event-bus.service.ts b/src/common/event-bus/event-bus.service.ts
index c336809..c5b0ed9 100644
--- a/src/common/event-bus/event-bus.service.ts
+++ b/src/common/event-bus/event-bus.service.ts
@@ -24,7 +24,7 @@ export class EventBusService {
 
   /** Async: persistent via BullMQ, retry + DLQ */
   async publishAsync(event: BaseDomainEvent): Promise<string> {
-    if (!this.queue) return;
+    if (!this.queue) return '';
     const job = await this.queue.add('domain-events', {
       eventType: event.eventType,
       eventId: event.eventId,