Testimonials won’t work anymore

Suddenly stopped working. I got those warning on DevlTools.

jquery.min.js?ver=3.5.1:1 Uncaught TypeError: Cannot read property 'data' of null
    at child.isActive (frontend.min.js?ver=3.0.1:1)
    at child.__construct (frontend-modules.min.js?ver=3.1.4:1)
    at init (frontend-modules.min.js?ver=3.1.4:1)
    at child.Module (frontend-modules.min.js?ver=3.1.4:1)
    at child (frontend-modules.min.js?ver=3.1.4:1)
    at child [as constructor] (frontend-modules.min.js?ver=3.1.4:1)
    at new child (frontend-modules.min.js?ver=3.1.4:1)
    at e.exports (frontend.min.js?ver=3.0.1:1)
    at _runHook (frontend.min.js?ver=3.1.4:1)
    at Object.doAction (frontend.min.js?ver=3.1.4:1)
isActive @ frontend.min.js?ver=3.0.1:1
__construct @ frontend-modules.min.js?ver=3.1.4:1
init @ frontend-modules.min.js?ver=3.1.4:1
Module @ frontend-modules.min.js?ver=3.1.4:1
child @ frontend-modules.min.js?ver=3.1.4:1
child @ frontend-modules.min.js?ver=3.1.4:1
child @ frontend-modules.min.js?ver=3.1.4:1
e.exports @ frontend.min.js?ver=3.0.1:1
_runHook @ frontend.min.js?ver=3.1.4:1
doAction @ frontend.min.js?ver=3.1.4:1
runReadyTrigger @ frontend.min.js?ver=3.1.4:1
(anonymous) @ frontend-modules.min.js?ver=3.1.4:1
each @ jquery.min.js?ver=3.5.1:1
each @ jquery.min.js?ver=3.5.1:1
runElementsHandlers @ frontend-modules.min.js?ver=3.1.4:1
onInit @ frontend-modules.min.js?ver=3.1.4:1
Module.trigger @ frontend-modules.min.js?ver=3.1.4:1
e.each.n.<computed> @ frontend-modules.min.js?ver=3.1.4:1
init @ frontend-modules.min.js?ver=3.1.4:1
Module @ frontend-modules.min.js?ver=3.1.4:1
child @ frontend-modules.min.js?ver=3.1.4:1
_createSuperInternal @ frontend-modules.min.js?ver=3.1.4:1
_default @ frontend-modules.min.js?ver=3.1.4:1
attachDocumentClass @ frontend.min.js?ver=3.1.4:1
(anonymous) @ frontend.min.js?ver=3.1.4:1
each @ jquery.min.js?ver=3.5.1:1
each @ jquery.min.js?ver=3.5.1:1
attachDocumentsClasses @ frontend.min.js?ver=3.1.4:1
_default @ frontend.min.js?ver=3.1.4:1
onDocumentLoaded @ frontend.min.js?ver=3.1.4:1
initOnReadyComponents @ frontend.min.js?ver=3.1.4:1
init @ frontend.min.js?ver=3.1.4:1
(anonymous) @ frontend.min.js?ver=3.1.4:1
e @ jquery.min.js?ver=3.5.1:1
t @ jquery.min.js?ver=3.5.1:1
setTimeout (async)
S.readyException @ jquery.min.js?ver=3.5.1:1
(anonymous) @ jquery.min.js?ver=3.5.1:1
e @ jquery.min.js?ver=3.5.1:1
t @ jquery.min.js?ver=3.5.1:1
setTimeout (async)
(anonymous) @ jquery.min.js?ver=3.5.1:1
c @ jquery.min.js?ver=3.5.1:1
fireWith @ jquery.min.js?ver=3.5.1:1
fire @ jquery.min.js?ver=3.5.1:1
c @ jquery.min.js?ver=3.5.1:1
fireWith @ jquery.min.js?ver=3.5.1:1
t @ jquery.min.js?ver=3.5.1:1
setTimeout (async)
(anonymous) @ jquery.min.js?ver=3.5.1:1
c @ jquery.min.js?ver=3.5.1:1
fireWith @ jquery.min.js?ver=3.5.1:1
fire @ jquery.min.js?ver=3.5.1:1
c @ jquery.min.js?ver=3.5.1:1
fireWith @ jquery.min.js?ver=3.5.1:1
ready @ jquery.min.js?ver=3.5.1:1
B @ jquery.min.js?ver=3.5.1:1
Show 5 more frames
common.min.js?ver=3.1.4:1 Uncaught ReferenceError: originalEvent is not defined
    at onError (common.min.js?ver=3.1.4:1)
    at dispatch (jquery.min.js?ver=3.5.1:1)
    at v.handle (jquery.min.js?ver=3.5.1:1)
onError @ common.min.js?ver=3.1.4:1
dispatch @ jquery.min.js?ver=3.5.1:1
v.handle @ jquery.min.js?ver=3.5.1:1
error (async)
add @ jquery.min.js?ver=3.5.1:1
s.event.add @ jquery-migrate.min.js?ver=3.3.2:1
(anonymous) @ jquery.min.js?ver=3.5.1:1
each @ jquery.min.js?ver=3.5.1:1
each @ jquery.min.js?ver=3.5.1:1
ke @ jquery.min.js?ver=3.5.1:1
on @ jquery.min.js?ver=3.5.1:1
bindEvents @ common.min.js?ver=3.1.4:1
init @ common.min.js?ver=3.1.4:1
Debug @ common.min.js?ver=3.1.4:1
initComponents @ common.min.js?ver=3.1.4:1
(anonymous) @ common.min.js?ver=3.1.4:1
(anonymous) @ common.min.js?ver=3.1.4:1
(anonymous) @ common.min.js?ver=3.1.4:1
jquery.min.js?ver=3.5.1:1 POST https://academicfastrack.com/?wc-ajax=get_refreshed_fragments 500 (Internal Server Error)