I found 3 instances of this:
media/com_ats/js/adm_tickets.js: looks like admin, should work fine
media/com_ats/js/ticket.js, at line 61 and 70, those are the breaking ones.
|Joomla! version (in x.y.z format)||3.9.13|
|PHP version (in x.y.z format)||7.3.12|
|Akeeba Ticket System version (x.y.z format)||3.0.4|