[TYPO3-shop] Error in handlescript payment_dibs.php

[contact at ingabs.com]

Hello ...
In past I configured tt_product with handlescript of payment gateway on
typo3 3.8.1, tt_product 1.2.7
It works very well.

Now I have to do a new e-commerce website.
I configured tt_product 2.5.1 on typo3 4.0.2

In the handelscript for payement (based on payment_DIBS.php), I get this
problem

line 54 : $orderUid = $this->order->getBlankUid();

Fatal error: Call to a member function getBlankUid() on a non-object in
mysite.com\typo3conf\ext\tt_products\pi1\payment_DIBS.php on line 54

I tried same changes like

$orderUid = $this->basketView->order->getBlankUid();

but nothing, I have the same error

Do you have any response or can you please help me.

Thank you.

Ingabs