Order fails after hikaserial-order with paypal-payment

-- HikaShop version -- : HikaShop Business 6.5.1 [2607200830], HikaSubscription: 6.1.0
-- Joomla version -- : 6.1.2
-- PHP version -- : 8.4.23
-- Browser(s) name and version -- : FF 152.0.9
-- Error-message(debug-mod must be tuned on) -- : 0
Call to a member function getType() on null

My Customers get redirected after sucessful paypal-payment to error page:

0
Call to a member function getType() on null

I have alos this error:
Deprecated: Creation of dynamic property plgHikashopProductorderListing::$paramBase is deprecated in /var/www/breisig.live/www/htdocs/plugins/hikashop/productorderlisting/productorderlisting.php on line 5