diff --git a/packages/backend/src/server/web/boot.js b/packages/backend/src/server/web/boot.js
index d4a2529e63..751e8619bf 100644
--- a/packages/backend/src/server/web/boot.js
+++ b/packages/backend/src/server/web/boot.js
@@ -45,8 +45,6 @@
 			localStorage.setItem('lang', lang);
 			localStorage.setItem('locale', await res.text());
 			localStorage.setItem('localeVersion', v);
-		} else if (localeOutdated) {
-			// nop
 		} else {
 			await checkUpdate();
 			renderError('LOCALE_FETCH_FAILED');
diff --git a/packages/client/src/init.ts b/packages/client/src/init.ts
index da5b0489ab..27ed781060 100644
--- a/packages/client/src/init.ts
+++ b/packages/client/src/init.ts
@@ -42,10 +42,6 @@ import { getAccountFromId } from '@/scripts/get-account-from-id';
 
 console.info(`Misskey v${version}`);
 
-// boot.jsのやつを解除
-window.onerror = null;
-window.onunhandledrejection = null;
-
 if (_DEV_) {
 	console.warn('Development mode!!!');
 
@@ -224,6 +220,10 @@ const rootEl = document.createElement('div');
 document.body.appendChild(rootEl);
 app.mount(rootEl);
 
+// boot.jsのやつを解除
+window.onerror = null;
+window.onunhandledrejection = null;
+
 reactionPicker.init();
 
 if (splash) {