diff --git a/src/queue/processors/inbox.ts b/src/queue/processors/inbox.ts
index 8a292107b..1d35079e9 100644
--- a/src/queue/processors/inbox.ts
+++ b/src/queue/processors/inbox.ts
@@ -47,7 +47,15 @@ export default async (job: Bull.Job<InboxJobData>): Promise<string> => {
 
 	// keyIdでわからなければ、activity.actorを元にDBから取得 || activity.actorを元にリモートから取得
 	if (authUser == null) {
-		authUser = await dbResolver.getAuthUserFromApId(getApId(activity.actor));
+		try {
+			authUser = await dbResolver.getAuthUserFromApId(getApId(activity.actor));
+		} catch (e) {
+			// 対象が4xxならスキップ
+			if (e.statusCode >= 400 && e.statusCode < 500) {
+				return `skip: Ignored deleted actors on both ends ${activity.actor} - ${e.statusCode}`;
+			}
+			throw `Error in actor ${activity.actor} - ${e.statusCode || e}`;
+		}
 	}
 
 	// それでもわからなければ終了