Javascript error after update to WP 4.8?

Replies: 0

Hi!
I just noticed a javascript error on my page that should be fixed quickly. Does anybody know if it is related to the latest wordpress update and how I can fix it?
It is on this page: https://www.mieterverein-augsburg.de/mitgliedschaft/

The chrome console tells me this:

admin-bar.min.js?ver=4.8:1 Uncaught TypeError: this.on is not a function
at HTMLDocument.<anonymous> (admin-bar.min.js?ver=4.8:1)
at Object.resolveWith (jquery.js:1016)
at Function.ready (jquery.js:437)
at HTMLDocument.DOMContentLoaded (jquery.js:923)

Thanks so much!
Best,
Hanna