Failed order save - order_url

Hi

Am writing a custom payment plugin and seem to be getting error when trying to save an amended order.
Basically I am saving some extra fields to the order in the 'onAfterOrderConfirm' method of the payment plugin and it fails with following message :

Unknown column 'order_url' in 'field list'

Obviously this is not in the database table and a search reveals that is set in administrator/components/com_hikashop/classes/order.php in the 'loadOrderNotification' method, and is then retrieved in the following places :

media/com_hikashop/mail/order_creation_notification.text.php
media/com_hikashop/mail/order_status_notification.html.php
media/com_hikashop/mail/order_admin_notification.html.php

Is there a fix for this?

Thanks for that.......