Fatal error: Uncaught TypeError: mysqli_ping(): Argument #1 ($mysql) must be of type mysqli, null given in /var/www/vhosts/duffer.in/session/session.php:331
Stack trace:
#0 /var/www/vhosts/duffer.in/session/session.php(331): mysqli_ping()
#1 /var/www/vhosts/duffer.in/session/session.php(11): session->_mysqli_ping()
#2 /var/www/vhosts/duffer.in/dbcon.php(26): session->__construct()
#3 /var/www/vhosts/duffer.in/desktop/header.php(2): include_once('...')
#4 /var/www/vhosts/duffer.in/desktop/index.php(1): include_once('...')
#5 /var/www/vhosts/duffer.in/index.php(8): include('...')
#6 {main}
thrown in /var/www/vhosts/duffer.in/session/session.php on line 331