diff --git a/packages/backend/src/services/instance-actor.ts b/packages/backend/src/services/instance-actor.ts
index 279142b32..15bdc674f 100644
--- a/packages/backend/src/services/instance-actor.ts
+++ b/packages/backend/src/services/instance-actor.ts
@@ -1,7 +1,7 @@
 import { IsNull } from 'typeorm';
 import { ILocalUser } from '@/models/entities/user.js';
 import { Users } from '@/models/index.js';
-import { createSystemUser } from './create-system-user.js';
+import { getSystemUser } from './system-user.js';
 
 const ACTOR_USERNAME = 'instance.actor' as const;
 
@@ -12,7 +12,7 @@ let instanceActor = await Users.findOneBy({
 
 export async function getInstanceActor(): Promise<ILocalUser> {
 	if (!instanceActor) {
-		instanceActor = await createSystemUser(ACTOR_USERNAME) as ILocalUser;
+		instanceActor = await getSystemUser(ACTOR_USERNAME) as ILocalUser;
 	}
 
 	return instanceActor;
diff --git a/packages/backend/src/services/relay.ts b/packages/backend/src/services/relay.ts
index 21b869a82..de7155ea0 100644
--- a/packages/backend/src/services/relay.ts
+++ b/packages/backend/src/services/relay.ts
@@ -9,7 +9,7 @@ import { genId } from '@/misc/gen-id.js';
 import { Cache } from '@/misc/cache.js';
 import { Relay } from '@/models/entities/relay.js';
 import { MINUTE } from '@/const.js';
-import { createSystemUser } from './create-system-user.js';
+import { getSystemUser } from './system-user.js';
 
 const ACTOR_USERNAME = 'relay.actor' as const;
 
@@ -24,16 +24,8 @@ const relaysCache = new Cache<Relay[]>(
 	}),
 );
 
-export async function getRelayActor(): Promise<ILocalUser> {
-	const user = await Users.findOneBy({
-		host: IsNull(),
-		username: ACTOR_USERNAME,
-	});
-
-	if (user) return user as ILocalUser;
-
-	const created = await createSystemUser(ACTOR_USERNAME);
-	return created as ILocalUser;
+async function getRelayActor(): Promise<ILocalUser> {
+	return await getSystemUser(ACTOR_USERNAME);
 }
 
 export async function addRelay(inbox: string): Promise<Relay> {
diff --git a/packages/backend/src/services/create-system-user.ts b/packages/backend/src/services/system-user.ts
similarity index 86%
rename from packages/backend/src/services/create-system-user.ts
rename to packages/backend/src/services/system-user.ts
index 8e39b00fb..2ad32a1c4 100644
--- a/packages/backend/src/services/create-system-user.ts
+++ b/packages/backend/src/services/system-user.ts
@@ -2,6 +2,7 @@ import { v4 as uuid } from 'uuid';
 import { IsNull } from 'typeorm';
 import { genRsaKeyPair } from '@/misc/gen-key-pair.js';
 import { hashPassword } from '@/misc/password.js';
+import { Users } from '@/models/index.js';
 import { User } from '@/models/entities/user.js';
 import { UserProfile } from '@/models/entities/user-profile.js';
 import { genId } from '@/misc/gen-id.js';
@@ -10,7 +11,14 @@ import { UsedUsername } from '@/models/entities/used-username.js';
 import { db } from '@/db/postgre.js';
 import generateNativeUserToken from '@/server/api/common/generate-native-user-token.js';
 
-export async function createSystemUser(username: string): Promise<User> {
+export async function getSystemUser(username: string): Promise<User> {
+	const exist = await Users.findBy({
+		usernameLower: username.toLowerCase(),
+		host: IsNull(),
+	});
+
+	if (exist) return exist;
+
 	const password = await hashPassword(uuid());
 
 	// Generate secret
@@ -22,13 +30,6 @@ export async function createSystemUser(username: string): Promise<User> {
 
 	// Start transaction
 	await db.transaction(async transactionalEntityManager => {
-		const exist = await transactionalEntityManager.countBy(User, {
-			usernameLower: username.toLowerCase(),
-			host: IsNull(),
-		});
-
-		if (exist) throw new Error('the user is already exists');
-
 		account = await transactionalEntityManager.insert(User, {
 			id: genId(),
 			createdAt: new Date(),