diff --git a/packages/hydrooj/bin/commands.ts b/packages/hydrooj/bin/commands.ts
index ef3dd679c..cfe12e6b3 100644
--- a/packages/hydrooj/bin/commands.ts
+++ b/packages/hydrooj/bin/commands.ts
@@ -167,6 +167,7 @@ if (!argv.args[0] || argv.args[0] === 'cli') {
         } else throw new Error(`Unsupported install source: ${src}`);
         if (!newAddonPath) throw new Error('Addon download failed');
         console.log('Installing depedencies');
+        if (!fs.existsSync(path.join(newAddonPath, 'package.json'))) throw new Error('Invalid plugin file');
         child.execSync('yarn --production', { stdio: 'inherit', cwd: newAddonPath });
         child.execSync(`hydrooj addon add '${newAddonPath}'`);
         fs.writeFileSync(path.join(newAddonPath, '__metadata__'), JSON.stringify({
diff --git a/packages/hydrooj/src/lib/i18n.ts b/packages/hydrooj/src/lib/i18n.ts
index bbf26464c..2d9415f94 100644
--- a/packages/hydrooj/src/lib/i18n.ts
+++ b/packages/hydrooj/src/lib/i18n.ts
@@ -65,7 +65,7 @@ global.Hydro.locales = new Proxy(translations, {
             get(s, key) {
                 if (typeof key === 'string') return app.i18n.get(key, lang);
                 const result = {};
-                for (let i = s.length - 1; i; i--) Object.assign(result, s[i]);
+                for (let i = s.length - 1; i >= 0; i--) Object.assign(result, s[i]);
                 return result;
             },
             has(s, key: string) {