[TYPO3-project-seminars] Error unregister

[Maik Bossels]

Hello,

I get the following error message when I try to use the unregister link.
 
Catchable fatal error: Argument 1 passed to 
tx_seminars_pi1_frontEndEditor::setFormConfiguration() must be an array, 
null given, called in 
/html/typo3conf/ext/seminars/pi1/class.tx_seminars_pi1_registrationEditor.php 
on line 203 and defined in 
/html/typo3conf/ext/seminars/pi1/class.tx_seminars_pi1_frontEndEditor.php 
on line 100

Any ideas where the error comes from?

thanks

Maik