I have issues with the advanced slideshow, when it is enabled it gives the folowing error in the frontend: Call to undefined method Joomla\CMS\Application\SiteApplication::isSite()
or
HTTP 500 Whoops, looks like something went wrong.
json_decode(): Argument #1 ($json) must be of type string, stdClass given
Tried with differernt templates, even the J4 standard and still the same issue.
SPPB version: 5.1.3
Joomla: 4.3.4