1.5.2 Problem with invoice

Just upgraded to 1.5.2 (Business Ed.) and getting this error in the lightbox when I try to open the invoice and shipping invoice in the backend for an order:

Invoice:
Fatal error: Call to a member function getFields() on a non-object in /home/xxxxxx/public_html/administrator/components/com_hikashop/views/order/view.html.php on line 350

???

cheers!

Indeed. Please edit the file administrator/components/com_hikashop/views/order/view.html.php and add the line:
$fieldsClass = hikashop_get('class.field');

just before that line 350.