Can’t open accordion if not logged in

Hey,

I can’t expand an FAQ if I’m not logged in.
But that’s only been the case for a while, generally the whole thing used to work.
An error message comes up, but it’s always there whether I’m logged in or not. I tested it in Chrome, Safari and Firefox, if I log in to the wordpress interface it works, otherwise not.

Firefox:

Uncaught TypeError: r is undefined
    jQuery 5
    wp_faq_accordion_init wp-faq-public.js:304
    <anonymous> wp-faq-public.js:298
    <anonymous> wp-faq-public.js:300
jquery-migrate.min.js:2:1203

Safari:

[Error] TypeError: undefined is not an object (evaluating 'r.apply')
	(anonyme Funktion) (jquery-migrate.min.js:2:1205)
	find (jquery.min.js:2:30576)
	(anonyme Funktion) (jquery-migrate.min.js:2:1833)
	st (jquery.min.js:1:10882)
	wp_faq_accordion_init (wp-faq-public.js:304)
	(anonyme Funktion) (wp-faq-public.js:298)
	Globaler Code (wp-faq-public.js:300)

Chrome:

Uncaught TypeError: Cannot read properties of undefined (reading 'apply')
    at e.<computed> (jquery-migrate.min.js?ver=3.3.2:2:1205)
    at init.find (jquery.js:5557:32)
    at s.fn.init.init (jquery.js:132:20)
    at new s.fn.init (jquery-migrate.min.js?ver=3.3.2:2:1827)
    at st (jquery.js:63:2)
    at wp_faq_accordion_init (wp-faq-public.js?ver=3.6.7:304:2)
    at wp-faq-public.js?ver=3.6.7:298:2
    at wp-faq-public.js?ver=3.6.7:300:3

Does anyone have any ideas?
Thank you and best regards

The page I need help with: [log in to see the link]