[1472] Auth Routes example is broken

the live demo at https://nuxt-auth-routes.glitch.me/ doesnt works.

the browser console shows

Uncaught TypeError: Cannot read property 'split' of undefined
    at Object.exports.install (nuxt.bundle.js:18)
    at nuxt.bundle.js:2649
    at Object.<anonymous> (nuxt.bundle.js:2657)
    at __webpack_require__ (vendor.bundle.js:690)
    at fn (vendor.bundle.js:111)
    at Object.<anonymous> (nuxt.bundle.js:1732)
    at __webpack_require__ (vendor.bundle.js:690)
    at fn (vendor.bundle.js:111)
    at Object.<anonymous> (nuxt.bundle.js:720)
    at __webpack_require__ (vendor.bundle.js:690)
vendor.bundle.js:7912 You are running Vue in development mode.
Make sure to turn on production mode when deploying for production.
See more tips at https://vuejs.org/guide/deployment.html
nuxt.bundle.js:1103 [HMR] connected