diff --git a/packages/backend/src/core/CacheService.ts b/packages/backend/src/core/CacheService.ts
index c29a3ecd7e..a242f06142 100644
--- a/packages/backend/src/core/CacheService.ts
+++ b/packages/backend/src/core/CacheService.ts
@@ -398,6 +398,11 @@ export class CacheService implements OnApplicationShutdown {
 		return user as MiRemoteUser;
 	}
 
+	@bindThis
+	public findOptionalUserById(userId: MiUser['id']) {
+		return this.userByIdCache.fetchMaybe(userId, async () => await this.usersRepository.findOneBy({ id: userId }) ?? undefined);
+	}
+
 	@bindThis
 	public async getFollowStats(userId: MiUser['id']): Promise<FollowStats> {
 		return await this.userFollowStatsCache.fetch(userId, async () => {