Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, bool given in /srv/www/vhosts/numid.hi.uni-stuttgart.de/object_print.php:190 Stack trace: #0 /srv/www/vhosts/numid.hi.uni-stuttgart.de/object_print.php(190): implode('', false) #1 {main} thrown in /srv/www/vhosts/numid.hi.uni-stuttgart.de/object_print.php on line 190