[Flow] Segmentation fault: 11

[Mario]

I extended the AbstractParty model and created a new Account model which is linked to the \TYPO3\Flow\Security\Account via a OneToOne relationship. Now I want to create a new Account using a command controller and when setting the party for the new account I got a "Segmentation fault: 11". I am using the latest packages and can not find a reason for this. Any ideas?