Fatal error: Uncaught Error: Call to undefined function is_admin() in /home/dennis91/public_html/wp-content/plugins/the-events-calendar/src/admin-views/venue-map-fields.php:13
Stack trace:
#0 {main}
thrown in /home/dennis91/public_html/wp-content/plugins/the-events-calendar/src/admin-views/venue-map-fields.php on line 13