Fatal error: Uncaught TypeError: mysqli_close(): Argument #1 ($mysql) must be of type mysqli, null given in /home/wajihahs/public_html/Db.php:84 Stack trace: #0 /home/wajihahs/public_html/Db.php(84): mysqli_close(NULL) #1 [internal function]: Db->__destruct() #2 {main} thrown in /home/wajihahs/public_html/Db.php on line 84