Fatal error: Uncaught Error: Call to a member function query() on null in /var/www/vhosts/carbideonline.co.uk/httpdocs/product_list.php:19 Stack trace: #0 /var/www/vhosts/carbideonline.co.uk/httpdocs/product_list.php(8): sumParentAlternative() #1 /var/www/vhosts/carbideonline.co.uk/httpdocs/product_list.php(50): parentAlternative() #2 {main} thrown in /var/www/vhosts/carbideonline.co.uk/httpdocs/product_list.php on line 19