warning on the cart module

[ibnati]

hello

i see  sometime this warning on the cart module
Notice: Undefined property: stdClass::$orderdoneHtml in /var/www/vhosts/cjdesigners.com/weki.cjdesigners.com/components/com_virtuemart/helpers/cart.php on line 169

Notice: Undefined property: stdClass::$virtuemart_order_id in /var/www/vhosts/cjdesigners.com/weki.cjdesigners.com/components/com_virtuemart/helpers/cart.php on line 170

how can i fix this please ?