Fatal error: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, bool given in /var/www/html/asdf.net/cms/bin/classes/db.class.php:196 Stack trace: #0 /var/www/html/asdf.net/cms/bin/classes/db.class.php(196): mysqli_num_rows() #1 /var/www/html/asdf.net/cms/bin/classes/db.class.php(54): db->numRow() #2 /var/www/html/asdf.net/cms/bin/classes/db.class.php(14): db->exec() #3 /var/www/html/domains/139/anmeldung.php(21): db->__construct() #4 {main} thrown in /var/www/html/asdf.net/cms/bin/classes/db.class.php on line 196