Warning: Undefined variable $sql in /var/www/vhosts/stadtgeschichte-muenchen.de/httpdocs/klaenge/index.php on line 45

Fatal error: Uncaught ValueError: mysqli::query(): Argument #1 ($query) cannot be empty in /var/www/vhosts/stadtgeschichte-muenchen.de/httpdocs/klaenge/index.php:45 Stack trace: #0 /var/www/vhosts/stadtgeschichte-muenchen.de/httpdocs/klaenge/index.php(45): mysqli->query() #1 {main} thrown in /var/www/vhosts/stadtgeschichte-muenchen.de/httpdocs/klaenge/index.php on line 45