Sign up page submission systematically failing: Sign up is impossible

[Lindorf]

When I try to create a new account, via https://www.spotify.com/uk/signup/ or https://www.spotify.com/fr/signup/, after filling all the fields and validating the reCaptcha, the 'Sign Up' button systematically fails.

I get the following Javascript error:

Uncaught TypeError: Cannot read property 'type' of undefined
    at $.validator.highlight (eval at n.exports (spweb-site.min.211074e60f452b0c6cfe.js:1), <anonymous>:261:22)
    at $.validator.defaultShowErrors (eval at n.exports (spweb-site.min.211074e60f452b0c6cfe.js:1), <anonymous>:646:37)
    at $.validator.showErrors (eval at n.exports (spweb-site.min.211074e60f452b0c6cfe.js:1), <anonymous>:410:16)
    at _onAjaxSubmitSuccess (eval at n.exports (signup.b701995e57baf3baefbc.js:1), <anonymous>:65:32)
    at eval (eval at n.exports (signup.b701995e57baf3baefbc.js:1), <anonymous>:389:9)
    at callSubscriberWithDelayedExceptions (eval at n.exports (spweb-site.min.211074e60f452b0c6cfe.js:1), <anonymous>:62:13)
    at deliverMessage (eval at n.exports (spweb-site.min.211074e60f452b0c6cfe.js:1), <anonymous>:83:17)
    at deliverNamespaced (eval at n.exports (spweb-site.min.211074e60f452b0c6cfe.js:1), <anonymous>:94:13)
highlight

I tried with three different browsers (Chrome, Firefox, Edge) on Windows 10.

[Lindorf · Accepted solution]

I found the source of the error:

The error about the age (if you are less than 16 years old) is not handled correctly.