i18n: Cannot read property 'headers' of undefined after Nuxt Generate

Hello, another error appears after run npm run generate.

Steps:

1. try create a new nuxt project like: vue init vuetifyjs/nuxt my-project then npm install or yarn

2. install this nuxt-i18n plugin: yarn add nuxt-i18n then add some configuration to nuxt.config.js.

3. npm run dev works fine.

4. npm run generate shows many errors: like this:

 ROUTE  /en/pages/about

  TypeError: Cannot read property 'headers' of undefined

  - server-bundle.js:5621 module.exports.__webpack_exports__.default
    server-bundle.js:5621:43

  - server-bundle.js:1902 promisify
    server-bundle.js:1902:15

  - server-bundle.js:1883 middlewareSeries
    server-bundle.js:1883:10

  - server-bundle.js:5465 module.exports.__webpack_exports__.default
    server-bundle.js:5465:81

1. im sure that the errors from this plugin, i have disabled it from nuxt.config.js, and re run npm run generate and everything works fine.

2. is this plugin works with npm run generate ?

any help!

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