Hello, I cannot save any articles in Joomla following the 2.0.9 Helix Ultimate update

I get this error in the console: Uncaught TypeError: this._addClass is not a function jQuery 8 <anonymous> XXXX/plugins/system/helixultimate/assets/js/admin/blog-options.js?c21bf76670f0e20c1a357717e840ba2e:7 jQuery 8

If I unpublish the System - Helix Framework plugin I can then save and work in articles, but then the frontend fails to load.