These are the errors wordpress see:
[25-Jul-2019 07:48:38 UTC] PHP Warning: Use of undefined constant KITCHEN_PLUGIN_URL – assumed ‘KITCHEN_PLUGIN_URL’ (this will throw an Error in a future version of PHP) in /srv/htdocs/wp-content/plugins/vic-galleries/post-type/photo-gallery.php on line 29
[25-Jul-2019 07:48:38 UTC] PHP Warning: Invalid argument supplied for foreach() in /wordpress/core/5.2.2/wp-includes/rest-api/endpoints/class-wp-rest-controller.php on line 287
It looks like the theme needs the plugin to work correctly but at the same time, there are some errors.
