Fatal error: Uncaught TypeError: mysqli_query(): Argument #1 ($mysql) must be of type mysqli, null given in /homepages/1/d723977520/htdocs/cleaning/clients/index.php:7 Stack trace: #0 /homepages/1/d723977520/htdocs/cleaning/clients/index.php(7): mysqli_query(NULL, 'SELECT * FROM `...') #1 {main} thrown in /homepages/1/d723977520/htdocs/cleaning/clients/index.php on line 7