Warning: foreach() argument must be of type array|object, bool given in /var/www/html/wp-content/plugins/con-troll/pages/page-timeslot-list.php on line 9

Fatal error: Uncaught TypeError: array_map(): Argument #2 ($array) must be of type array, bool given in /var/www/html/wp-content/plugins/con-troll/pages/page-timeslot-list.php:38 Stack trace: #0 /var/www/html/wp-content/plugins/con-troll/pages/page-timeslot-list.php(38): array_map('helper_timeslot...', false) #1 /var/www/html/wp-includes/template-loader.php(106): include('/var/www/html/w...') #2 /var/www/html/wp-blog-header.php(19): require_once('/var/www/html/w...') #3 /var/www/html/index.php(17): require('/var/www/html/w...') #4 {main} thrown in /var/www/html/wp-content/plugins/con-troll/pages/page-timeslot-list.php on line 38