White schreen after external payment call

We are using the latest Hikashop 2.0.0 in Joomla! 2.5.8 and have added "IDEAL" as payment method with the payment extension from ideal-checkout ( www.ideal-checkout.nl ).
But now after getting the status from iDeal we always get a white screen.
Turning on debug mode shows this info. I See a message invalid_status.. Is this a Hikashop problem or is it an ideal-checkout problem?
The website is www.mooicv.nl

Kind regards, Evert

Debug console:
__default
session.counter ⇒ 28
session.timer.start ⇒ 1352925954
session.timer.last ⇒ 1352927633
session.timer.now ⇒ 1352927946
session.client.browser ⇒ Mozilla/5.0 (Windows NT 6.1; WOW64; rv:16.0) Gecko/20100101 Firefox/16.0
registry ⇒ {"com_hikashop":{"ssl_redirect":0,"zone_id":"150","vote":{"list_limit":"30"},"cart_id":19,"shipping_method":0,"shipping_id":0,"shipping_data":0,"cart_new":"0","payment_method":"idealcheckoutideal","payment_id","payment_data":{"payment_id":"3","payment_name":"iDEAL","payment_description":"

Betalen met iDEAL<\/p>","payment_images":"","payment_params":{"payment_currency":"1","payment_percentage":"0","invalid_status":"cancelled","pending_status":"created","verified_status":"confirmed"},"payment_type":"idealcheckoutideal","payment_zone_namekey":"","payment_access":"all","payment_shipping_methods":"manual_1","payment_currency":",1,","payment_price":0,"extension_id":"10093","name":"iDEAL Checkout - iDEAL","type":"plugin","element":"idealcheckoutideal","folder":"hikashoppayment","client_id":"0","enabled":"1","access":"1","protected":"0","manifest_cache":"","params":"","custom_data":"","system_data":"","checked_out":"0","checked_out_time":"0000-00-00 00:00:00","ordering":"37","state":"0"},"checkout_fields_ok":0,"order_id":30},"users":{"login":{"form":{"data":[],"return":"http:\/\/www.mooicv.nl\/"}}}}

Hi,

This is an ideal-checkout problem.
The blank page is a order notification page. This notification page ask for the plugin "idealcheckoutideal" to be called on his notification function.
The plugin has to manage the output for the page. Most of time, the plugin make some checks, save the order and redirect the user to another page.
It's like the plugin do nothing.

But I think that the plugin might not be name "idealcheckoutideal" but maybe "idealcheckout" so the notification url should be wrong in the plugin.

Regards,