Fatal error: Uncaught TypeError: Currencies::display_price(): Argument #1 ($price) must be of type float, null given, called in /var/www/fullofbooks.com.au/devl/htdocs/product_info.php on line 57 and defined in /var/www/fullofbooks.com.au/devl/includes/classes/Currencies.php:101 Stack trace: #0 /var/www/fullofbooks.com.au/devl/htdocs/product_info.php(57): Currencies->display_price() #1 {main} thrown in /var/www/fullofbooks.com.au/devl/includes/classes/Currencies.php on line 101