Hang when submitting at step-1

-- url of the page with the problem -- : Site currently offline
-- HikaShop version -- : 2.3.1
-- Joomla version -- : 2.5.20
-- PHP version -- : 5.5.91
-- Browser(s) name and version -- : XXXXX x.x.x
-- Error-message(debug-mod must be tuned on) -- :
PHP Notice: Trying to get property of non-object in /var/www/vhosts/zeno/administrator/components/com_hikashop/classes/cart.php on line 1566, referer: www.mysitename.com/index.php/elearning/checkout.html
PHP Notice: Undefined property: stdClass::$order_shipping_price in /var/www/vhosts/zeno/media/com_hikashop/mail/order_admin_notification.preload.php on line 243, referer: www.mysitename.com/index.php/elearning/checkout.html

Any ideas?

Hi,

Can you tell me where and how are you getting that issue, and also give me a link to the page where you have that issue so that we can directly test it ?

Thank you.