[phpBB Debug] PHP Warning: in file /var/www/vhosts/appmeier.eu/httpdocs/inc/page_header.php on line 42: mysqli_real_escape_string() expects parameter 1 to be mysqli, object given

Fatal error: Uncaught Error: Call to undefined method phpbb\db\driver\factory::mysqli_query() in /var/www/vhosts/appmeier.eu/httpdocs/inc/page_header.php:57 Stack trace: #0 /var/www/vhosts/appmeier.eu/httpdocs/regeln.php(8): include() #1 {main} thrown in /var/www/vhosts/appmeier.eu/httpdocs/inc/page_header.php on line 57