diff --git a/server/lib/activitypub/fetch.ts b/server/lib/activitypub/fetch.ts
index 549791f14..a8eefff80 100644
--- a/server/lib/activitypub/fetch.ts
+++ b/server/lib/activitypub/fetch.ts
@@ -8,7 +8,7 @@ async function addFetchOutboxJob (actor: ActorModel) {
   const serverActor = await getServerActor()
   if (serverActor.id === actor.id) {
     logger.error('Cannot fetch our own outbox!')
-    return
+    return undefined
   }
 
   const payload = {
diff --git a/server/middlewares/validators/activitypub/activity.ts b/server/middlewares/validators/activitypub/activity.ts
index 15e8bb079..8c2920328 100644
--- a/server/middlewares/validators/activitypub/activity.ts
+++ b/server/middlewares/validators/activitypub/activity.ts
@@ -18,7 +18,7 @@ const activityPubValidator = [
     const remoteActor = res.locals.signature.actor as ActorModel
     if (serverActor.id === remoteActor.id) {
       logger.error('Receiving request in INBOX by ourselves!', req.body)
-      return res.sendStatus(409)
+      return res.status(409).end()
     }
 
     return next()