TypeError: Cannot read property 'hostname' of undefined

[Kazuto]

This is my configuration, but it does not work:
Latest version of nuxt-ssr-cache (1.5.1) and nuxtjs (2.14.0) is installed.

cache: {
    pages: [
      '/'
    ],

    store: {
      type: 'memory',
      max: 100,
      ttl: 604800 // 1 week
    }
  }