Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, false given in /var/home/utc-donnerskirchen_at/www/kalender/kalender.php:24
Stack trace:
#0 /var/home/utc-donnerskirchen_at/www/kalender/kalender.php(24): implode('', false)
#1 {main}
thrown in /var/home/utc-donnerskirchen_at/www/kalender/kalender.php on line 24