diff --git a/packages/frontend/src/components/MkUrlPreview.vue b/packages/frontend/src/components/MkUrlPreview.vue
index cc2229a819..1a194ae9db 100644
--- a/packages/frontend/src/components/MkUrlPreview.vue
+++ b/packages/frontend/src/components/MkUrlPreview.vue
@@ -85,7 +85,6 @@ import { deviceKind } from '@/scripts/device-kind';
 import MkButton from '@/components/MkButton.vue';
 import { versatileLang } from '@/scripts/intl-const';
 import { defaultStore } from '@/store';
-import { ErrorHandling } from '@/error';
 
 type SummalyResult = Awaited<ReturnType<typeof summaly>>;
 
@@ -125,7 +124,7 @@ let tweetHeight = $ref(150);
 let unknownUrl = $ref(false);
 
 const requestUrl = new URL(props.url);
-if (!['http:', 'https:'].includes(requestUrl.protocol)) throw ErrorHandling('invalid url');
+if (!['http:', 'https:'].includes(requestUrl.protocol)) throw new Error('invalid url');
 
 if (requestUrl.hostname === 'twitter.com' || requestUrl.hostname === 'mobile.twitter.com') {
 	const m = requestUrl.pathname.match(/^\/.+\/status(?:es)?\/(\d+)/);
diff --git a/packages/frontend/src/components/MkYouTubePlayer.vue b/packages/frontend/src/components/MkYouTubePlayer.vue
index 64e715ea20..9b9c3d5ec4 100644
--- a/packages/frontend/src/components/MkYouTubePlayer.vue
+++ b/packages/frontend/src/components/MkYouTubePlayer.vue
@@ -27,14 +27,13 @@ SPDX-License-Identifier: AGPL-3.0-only
 import MkWindow from '@/components/MkWindow.vue';
 import { versatileLang } from '@/scripts/intl-const';
 import { defaultStore } from '@/store';
-import { ErrorHandling } from '@/error';
 
 const props = defineProps<{
 	url: string;
 }>();
 
 const requestUrl = new URL(props.url);
-if (!['http:', 'https:'].includes(requestUrl.protocol)) throw ErrorHandling('invalid url');
+if (!['http:', 'https:'].includes(requestUrl.protocol)) throw new Error('invalid url');
 
 let fetching = $ref(true);
 let title = $ref<string | null>(null);
diff --git a/packages/frontend/src/components/global/MkUrl.vue b/packages/frontend/src/components/global/MkUrl.vue
index 0f76e436e0..6bcfe3e1a5 100644
--- a/packages/frontend/src/components/global/MkUrl.vue
+++ b/packages/frontend/src/components/global/MkUrl.vue
@@ -30,7 +30,6 @@ import { url as local } from '@/config';
 import * as os from '@/os';
 import { useTooltip } from '@/scripts/use-tooltip';
 import { safeURIDecode } from '@/scripts/safe-uri-decode';
-import { ErrorHandling } from '@/error';
 
 const props = defineProps<{
 	url: string;
@@ -39,7 +38,7 @@ const props = defineProps<{
 
 const self = props.url.startsWith(local);
 const url = new URL(props.url);
-if (!['http:', 'https:'].includes(url.protocol)) throw ErrorHandling('invalid url');
+if (!['http:', 'https:'].includes(url.protocol)) throw new Error('invalid url');
 const el = ref();
 
 useTooltip(el, (showing) => {
diff --git a/packages/frontend/src/error.ts b/packages/frontend/src/error.ts
deleted file mode 100644
index 865d276496..0000000000
--- a/packages/frontend/src/error.ts
+++ /dev/null
@@ -1,7 +0,0 @@
-export function ErrorHandling(message: string): Error {
-	const error = new Error(message);
-	if (process.env.NODE_ENV === 'production') {
-		error.stack = undefined;
-	}
-	return error;
-}
diff --git a/packages/frontend/src/pages/auth.vue b/packages/frontend/src/pages/auth.vue
index 82a6eefe02..2cc396fc24 100644
--- a/packages/frontend/src/pages/auth.vue
+++ b/packages/frontend/src/pages/auth.vue
@@ -50,7 +50,6 @@ import * as os from '@/os';
 import { $i, login } from '@/account';
 import { definePageMetadata } from '@/scripts/page-metadata';
 import { i18n } from '@/i18n';
-import { ErrorHandling } from '@/error';
 
 const props = defineProps<{
 	token: string;
@@ -63,7 +62,7 @@ function accepted() {
 	state = 'accepted';
 	if (session && session.app.callbackUrl) {
 		const url = new URL(session.app.callbackUrl);
-		if (['javascript:', 'file:', 'data:', 'mailto:', 'tel:'].includes(url.protocol)) throw ErrorHandling('invalid url');
+		if (['javascript:', 'file:', 'data:', 'mailto:', 'tel:'].includes(url.protocol)) throw new Error('invalid url');
 		location.href = `${session.app.callbackUrl}?token=${session.token}`;
 	}
 }
diff --git a/packages/frontend/src/pages/follow.vue b/packages/frontend/src/pages/follow.vue
index 76c2157f91..de3b4a57ac 100644
--- a/packages/frontend/src/pages/follow.vue
+++ b/packages/frontend/src/pages/follow.vue
@@ -14,7 +14,6 @@ import * as Acct from 'misskey-js/built/acct';
 import * as os from '@/os';
 import { mainRouter } from '@/router';
 import { i18n } from '@/i18n';
-import { ErrorHandling } from '@/error';
 
 async function follow(user): Promise<void> {
 	const { canceled } = await os.confirm({
@@ -34,7 +33,7 @@ async function follow(user): Promise<void> {
 
 const acct = new URL(location.href).searchParams.get('acct');
 if (acct == null) {
-	throw ErrorHandling('acct required');
+	throw new Error('acct required');
 }
 
 let promise;
diff --git a/packages/frontend/src/pages/instance-info.vue b/packages/frontend/src/pages/instance-info.vue
index c68c21fa81..24355c0556 100644
--- a/packages/frontend/src/pages/instance-info.vue
+++ b/packages/frontend/src/pages/instance-info.vue
@@ -136,7 +136,6 @@ import MkUserCardMini from '@/components/MkUserCardMini.vue';
 import MkPagination from '@/components/MkPagination.vue';
 import { getProxiedImageUrlNullable } from '@/scripts/media-proxy';
 import { dateString } from '@/filters/date';
-import { ErrorHandling } from '@/error';
 
 const props = defineProps<{
 	host: string;
@@ -174,8 +173,8 @@ async function fetch(): Promise<void> {
 }
 
 async function toggleBlock(): Promise<void> {
-	if (!meta) throw ErrorHandling('No meta?');
-	if (!instance) throw ErrorHandling('No instance?');
+	if (!meta) throw new Error('No meta?');
+	if (!instance) throw new Error('No instance?');
 	const { host } = instance;
 	await os.api('admin/update-meta', {
 		blockedHosts: isBlocked ? meta.blockedHosts.concat([host]) : meta.blockedHosts.filter(x => x !== host),
@@ -183,7 +182,7 @@ async function toggleBlock(): Promise<void> {
 }
 
 async function toggleSuspend(): Promise<void> {
-	if (!instance) throw ErrorHandling('No instance?');
+	if (!instance) throw new Error('No instance?');
 	await os.api('admin/federation/update-instance', {
 		host: instance.host,
 		isSuspended: suspended,
@@ -191,7 +190,7 @@ async function toggleSuspend(): Promise<void> {
 }
 
 function refreshMetadata(): void {
-	if (!instance) throw ErrorHandling('No instance?');
+	if (!instance) throw new Error('No instance?');
 	os.api('admin/federation/refresh-remote-instance-metadata', {
 		host: instance.host,
 	});
diff --git a/packages/frontend/src/pages/miauth.vue b/packages/frontend/src/pages/miauth.vue
index 0a392f50a6..4df40db917 100644
--- a/packages/frontend/src/pages/miauth.vue
+++ b/packages/frontend/src/pages/miauth.vue
@@ -50,7 +50,6 @@ import * as os from '@/os';
 import { $i, login } from '@/account';
 import { i18n } from '@/i18n';
 import { definePageMetadata } from '@/scripts/page-metadata';
-import { ErrorHandling } from '@/error';
 
 const props = defineProps<{
 	session: string;
@@ -76,7 +75,7 @@ async function accept(): Promise<void> {
 	state = 'accepted';
 	if (props.callback) {
 		const cbUrl = new URL(props.callback);
-		if (['javascript:', 'file:', 'data:', 'mailto:', 'tel:'].includes(cbUrl.protocol)) throw ErrorHandling('invalid url');
+		if (['javascript:', 'file:', 'data:', 'mailto:', 'tel:'].includes(cbUrl.protocol)) throw new Error('invalid url');
 		cbUrl.searchParams.set('session', props.session);
 		location.href = cbUrl.href;
 	}
diff --git a/packages/frontend/src/pages/settings/general.vue b/packages/frontend/src/pages/settings/general.vue
index 859051c406..3b39a5c00a 100644
--- a/packages/frontend/src/pages/settings/general.vue
+++ b/packages/frontend/src/pages/settings/general.vue
@@ -185,7 +185,6 @@ import { unisonReload } from '@/scripts/unison-reload';
 import { i18n } from '@/i18n';
 import { definePageMetadata } from '@/scripts/page-metadata';
 import { miLocalStorage } from '@/local-storage';
-import { ErrorHandling } from '@/error';
 
 const lang = ref(miLocalStorage.getItem('lang'));
 const fontSize = ref(miLocalStorage.getItem('fontSize'));
@@ -277,7 +276,7 @@ function downloadEmojiIndex(lang: string) {
 		function download() {
 			switch (lang) {
 				case 'en-US': return import('../../unicode-emoji-indexes/en-US.json').then(x => x.default);
-				default: throw ErrorHandling('unrecognized lang: ' + lang);
+				default: throw new Error('unrecognized lang: ' + lang);
 			}
 		}
 		currentIndexes[lang] = await download();
diff --git a/packages/frontend/src/pages/settings/preferences-backups.vue b/packages/frontend/src/pages/settings/preferences-backups.vue
index fb5d70af8f..eb33cbd3a4 100644
--- a/packages/frontend/src/pages/settings/preferences-backups.vue
+++ b/packages/frontend/src/pages/settings/preferences-backups.vue
@@ -51,8 +51,6 @@ import { i18n } from '@/i18n';
 import { version, host } from '@/config';
 import { definePageMetadata } from '@/scripts/page-metadata';
 import { miLocalStorage } from '@/local-storage';
-import { ErrorHandling } from '@/error';
-
 const { t, ts } = i18n;
 
 const defaultStoreSaveKeys: (keyof typeof defaultStore['state'])[] = [
@@ -135,27 +133,27 @@ function isObject(value: unknown): value is Record<string, unknown> {
 }
 
 function validate(profile: any): void {
-	if (!isObject(profile)) throw ErrorHandling('not an object');
+	if (!isObject(profile)) throw new Error('not an object');
 
 	// Check if unnecessary properties exist
-	if (Object.keys(profile).some(key => !profileProps.includes(key))) throw ErrorHandling('Unnecessary properties exist');
+	if (Object.keys(profile).some(key => !profileProps.includes(key))) throw new Error('Unnecessary properties exist');
 
-	if (!profile.name) throw ErrorHandling('Missing required prop: name');
-	if (!profile.misskeyVersion) throw ErrorHandling('Missing required prop: misskeyVersion');
+	if (!profile.name) throw new Error('Missing required prop: name');
+	if (!profile.misskeyVersion) throw new Error('Missing required prop: misskeyVersion');
 
 	// Check if createdAt and updatedAt is Date
 	// https://zenn.dev/lollipop_onl/articles/eoz-judge-js-invalid-date
-	if (!profile.createdAt || Number.isNaN(new Date(profile.createdAt as any).getTime())) throw ErrorHandling('createdAt is falsy or not Date');
+	if (!profile.createdAt || Number.isNaN(new Date(profile.createdAt as any).getTime())) throw new Error('createdAt is falsy or not Date');
 	if (profile.updatedAt) {
 		if (Number.isNaN(new Date(profile.updatedAt as any).getTime())) {
-			throw ErrorHandling('updatedAt is not Date');
+			throw new Error('updatedAt is not Date');
 		}
 	} else if (profile.updatedAt !== null) {
-		throw ErrorHandling('updatedAt is not null');
+		throw new Error('updatedAt is not null');
 	}
 
-	if (!profile.settings) throw ErrorHandling('Missing required prop: settings');
-	if (!isObject(profile.settings)) throw ErrorHandling('Invalid prop: settings');
+	if (!profile.settings) throw new Error('Missing required prop: settings');
+	if (!isObject(profile.settings)) throw new Error('Invalid prop: settings');
 }
 
 function getSettings(): Profile['settings'] {
diff --git a/packages/frontend/src/scripts/please-login.ts b/packages/frontend/src/scripts/please-login.ts
index 7b63f775ac..f0eebf2242 100644
--- a/packages/frontend/src/scripts/please-login.ts
+++ b/packages/frontend/src/scripts/please-login.ts
@@ -22,5 +22,5 @@ export function pleaseLogin(path?: string) {
 		},
 	}, 'closed');
 
-	console.log('signin required');
+	throw new Error('signin required');
 }
diff --git a/packages/frontend/src/scripts/time.ts b/packages/frontend/src/scripts/time.ts
index 506c7a9da7..4479db1081 100644
--- a/packages/frontend/src/scripts/time.ts
+++ b/packages/frontend/src/scripts/time.ts
@@ -3,8 +3,6 @@
  * SPDX-License-Identifier: AGPL-3.0-only
  */
 
-import { ErrorHandling } from '@/error';
-
 const dateTimeIntervals = {
 	'day': 86400000,
 	'hour': 3600000,
@@ -21,7 +19,7 @@ export function dateUTC(time: number[]): Date {
 		: time.length === 7 ? Date.UTC(time[0], time[1], time[2], time[3], time[4], time[5], time[6])
 		: null;
 
-	if (!d) throw ErrorHandling('wrong number of arguments');
+	if (!d) throw new Error('wrong number of arguments');
 
 	return new Date(d);
 }
diff --git a/packages/frontend/src/scripts/upload.ts b/packages/frontend/src/scripts/upload.ts
index cb7ebeaffa..f5ec4b60b4 100644
--- a/packages/frontend/src/scripts/upload.ts
+++ b/packages/frontend/src/scripts/upload.ts
@@ -12,7 +12,6 @@ import { apiUrl } from '@/config';
 import { $i } from '@/account';
 import { alert } from '@/os';
 import { i18n } from '@/i18n';
-import { ErrorHandling } from '@/error';
 
 type Uploading = {
 	id: string;
@@ -35,7 +34,7 @@ export function uploadFile(
 	name?: string,
 	keepOriginal: boolean = defaultStore.state.keepOriginalUploading,
 ): Promise<Misskey.entities.DriveFile> {
-	if ($i == null) console.log('Not logged in');
+	if ($i == null) throw new Error('Not logged in');
 
 	if (folder && typeof folder === 'object') folder = folder.id;