Error after payment

[JosBlo]

After a iDeal-payment with ccIDEALPlatform on Joomla 2.5.1 and the latest VM 2.01N i get this error:

Fatal error: Cannot use object of type stdClass as array in /home/koopkaar/public_html/components/com_virtuemart/helpers/cart.php on line 1003

Is this a configuration error?

Regards, Jos