Failed to execute querySelectorAll on Element

hello, i started getting an error i cannot figure out or backtrack and hope someone can help find the issue

DOMException: Failed to execute 'querySelectorAll'

DOMException: Failed to execute 'querySelectorAll' on 'Element': '\' is not a valid selector.

points to

e.querySelectorAll("\\f"),

thanks in advance

What url, file and line? It could be a browser extension.
LiteCart uses jQuery instead of querySelectorAll().

happens in incognito mode too 

i think its saying jquery-3.6.3.min.js

DOMException: Failed to execute 'querySelectorAll' on 'Element': '\' is not a valid selector.

thanks

Guide me. What requested page?
https://demo.litecart.net/

hello, it seems to happen on most pages, home etc. 
if i inspect the demo site, also

DOMException: Failed to execute 'querySelector' on 'Document': ':has(*,:jqfake)' is not a valid selector.

not sure what it all means
let me know, exactly what you need to know if i can help/

My browser console is clean from errors.
I still think this can be a browser add-on.

Try a different browser or disable all extensions.