Warning message occasionally in order history

Occasionally I am seeing a warning in the order history, pertaining the confirmation of the payment. The warning I see is:

Warning: Invalid argument supplied for foreach() in /home/xxxxx/public_html/website/components/com_hikashop/controllers/checkout.php on line 1204

We accept payments using regular PayPal as well as PayPal Pro, but only am seeing the error with payments made through the PayPal Pro payment plugin. The payment is received, and the order is properly confirmed. However I do notice that those orders don't show properly in the reports.

I am running HikaShop 1.6.0 on Joomla 1.5.26 (soon to be migrated to 2.5).

Anyone have any thoughts as to what is causing the warning?

Hi vanboke,

It seems to be related on the coupon taxes.
Are you sure that you have well configured your taxes ?