Cannot set property 'locale' of undefined

Version

v5.3.0

Reproduction link

• demo: https://willin.guru
• source: https://github.com/willin/willin.github.io

Steps to reproduce

when development mode it’s ok, but when built and deployed it shown error.

What is expected ?

works properly

What is actually happening?

c6b25ed7d1e571a9b85f.js:1 [nuxt] Error while initializing app TypeError: Cannot set property 'locale' of undefined
    at f.<anonymous> (c6b25ed7d1e571a9b85f.js:1)
    at 33b42310abd05a803713.js:2
    at 33b42310abd05a803713.js:2
    at Array.forEach (<anonymous>)
    at 33b42310abd05a803713.js:2
    at f._withCommit (33b42310abd05a803713.js:2)
    at f.commit (33b42310abd05a803713.js:2)
    at f.commit (33b42310abd05a803713.js:2)
    at o.commit (33b42310abd05a803713.js:2)
    at f.setLocale (c6b25ed7d1e571a9b85f.js:1)

source code: https://github.com/nuxt-community/nuxt-i18n/blob/master/src/plugins/main.js#L41

state got undefined

Additional comments?

Config:

  modules: [
    ['nuxt-i18n', {
      locales: [
        { name: '简体中文', code: 'zh', iso: 'zh-CN', file: 'zh.js' },
        { name: 'English', code: 'en', iso: 'en-US', file: 'en.js' }
      ],
      lazy: true,
      langDir: 'locales/',
      strategy: 'prefix',
      defaultLocale: 'zh',
      detectBrowserLanguage: {
        useCookie: true,
        cookieKey: 'i18n_redirected'
      },
      rootRedirect: 'en',
      vueI18n: {
        fallbackLocale: 'en'
      }
    }]
  ],

deployed files: https://dev.tencent.com/u/willin/p/willin.wang/git/tree/master

• ROOT
• 404.html
• zh/ folder
• en/ folder

<div align="right">_{This bug report is available on Nuxt community (#c183)}</div>

[rchl]

@sustained Can you also check with v6.0.2 just to establish whether it’s a recent regression or not?

Also, where is load state button in Vue Devtools? I couldn’t find that one but if I click Force refresh then whole Vue devtools kinda crash (stop reacting).

[sustained]

[sustained@aurora nuxt-dynamic-markdown-example-project]$ cat node_modules/nuxt-i18n/package.json | grep '"version":'
  "version": "6.0.2"

@rchl