diff --git a/packages/backend/src/core/AbuseReportService.ts b/packages/backend/src/core/AbuseReportService.ts
index bccb9f86f6..8b3c596f50 100644
--- a/packages/backend/src/core/AbuseReportService.ts
+++ b/packages/backend/src/core/AbuseReportService.ts
@@ -14,6 +14,7 @@ import { ApRendererService } from '@/core/activitypub/ApRendererService.js';
 import { ModerationLogService } from '@/core/ModerationLogService.js';
 import { SystemAccountService } from '@/core/SystemAccountService.js';
 import { IdentifiableError } from '@/misc/identifiable-error.js';
+import { trackPromise } from '@/misc/promise-tracker.js';
 import { IdService } from './IdService.js';
 
 @Injectable()
@@ -68,11 +69,11 @@ export class AbuseReportService {
 			reports.push(report);
 		}
 
-		return Promise.all([
+		trackPromise(Promise.all([
 			this.abuseReportNotificationService.notifyAdminStream(reports),
 			this.abuseReportNotificationService.notifySystemWebhook(reports, 'abuseReport'),
 			this.abuseReportNotificationService.notifyMail(reports),
-		]);
+		]));
 	}
 
 	/**
diff --git a/packages/backend/src/core/CacheService.ts b/packages/backend/src/core/CacheService.ts
index 2d37cd6bab..84f6df3e21 100644
--- a/packages/backend/src/core/CacheService.ts
+++ b/packages/backend/src/core/CacheService.ts
@@ -350,6 +350,11 @@ export class CacheService implements OnApplicationShutdown {
 		}) ?? null;
 	}
 
+	@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 () => {
diff --git a/packages/backend/src/server/api/endpoints/users/report-abuse.ts b/packages/backend/src/server/api/endpoints/users/report-abuse.ts
index 81c0c526f0..fc2b57c4a5 100644
--- a/packages/backend/src/server/api/endpoints/users/report-abuse.ts
+++ b/packages/backend/src/server/api/endpoints/users/report-abuse.ts
@@ -9,6 +9,7 @@ import { GetterService } from '@/server/api/GetterService.js';
 import { RoleService } from '@/core/RoleService.js';
 import { AbuseReportService } from '@/core/AbuseReportService.js';
 import { ApiError } from '../../error.js';
+import { CacheService } from '@/core/CacheService.js';
 
 export const meta = {
 	tags: ['users'],
@@ -60,13 +61,14 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		private getterService: GetterService,
 		private roleService: RoleService,
 		private abuseReportService: AbuseReportService,
+		private readonly cacheService: CacheService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
 			// Lookup user
-			const targetUser = await this.getterService.getUser(ps.userId).catch(err => {
-				if (err.id === '15348ddd-432d-49c2-8a5a-8069753becff') throw new ApiError(meta.errors.noSuchUser);
-				throw err;
-			});
+			const targetUser = await this.cacheService.findOptionalUserById(ps.userId);
+			if (!targetUser) {
+				throw new ApiError(meta.errors.noSuchUser);
+			}
 
 			if (targetUser.id === me.id) {
 				throw new ApiError(meta.errors.cannotReportYourself);