Invalid IPN post - No Invoice# passed (Urgent)

Hi,

I have just added a new product, but received the error "Looks like an invalid IPN post - no Invoice# passed"

Code:

Exception Am_Exception_Paysystem_TransactionEmpty
Am_Paysystem_Transaction_Incoming->autoCreate [ library/Am/Paysystem/Transaction/Incoming.php : 287 ]
Am_Paysystem_Transaction_Incoming->validate [ library/Am/Paysystem/Transaction/Abstract.php : 48 ]
Am_Paysystem_Transaction_Abstract->process [ library/Am/Paysystem/Transaction/Incoming.php : 231 ]
Am_Paysystem_Transaction_Incoming->process [ library/Am/Paysystem/Abstract.php : 463 ]
Am_Paysystem_Abstract->directAction [ application/default/controllers/DirectController.php : 28 ]
DirectController->__call [ library/Am/Controller.php : 118 ]
Am_Controller->dispatch [ library/Zend/Controller/Dispatcher/Standard.php : 295 ]
Zend_Controller_Dispatcher_Standard->dispatch [ library/Zend/Controller/Front.php : 954 ]
Zend_Controller_Front->dispatch [ library/Am/App.php : 1916 ]
Am_App->run [ index.php : 43 ]

The old products are still working fine, but the new one is not. Please help!

If it's urgent submit a help-desk ticket.

I did, but my last one took about 5 days to get a response.

Did you get this resolved? I have the same problem with some of mine.