Fatal error: Uncaught TypeError: mysqli_num_rows(): Argument #1 ($result) must be of type mysqli_result, bool given in /homepages/9/d331041642/htdocs/blkneu/aaakalender2.php:136
Stack trace:
#0 /homepages/9/d331041642/htdocs/blkneu/aaakalender2.php(136): mysqli_num_rows(false)
#1 /homepages/9/d331041642/htdocs/blkneu/kalender2.php(287): kalender_ausgabe->set_tblkalender(Object(mysqli), '2022')
#2 {main}
thrown in /homepages/9/d331041642/htdocs/blkneu/aaakalender2.php on line 136