Fatal error: Uncaught Error: Call to undefined function is_admin() in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-tickets/includes/class-integration-general.php:8 Stack trace: #0 /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-tickets/includes/class-integration-general.php(49): evotx_int->__construct() #1 {main} thrown in /users/laufgruppe-lvb/www/wordpress/wp-content/plugins/eventon-tickets/includes/class-integration-general.php on line 8