Mandatory information about my setup:

Have I searched the tickets before posting? No
Have I searched the forum before posting? No
Have I read the documentation before posting (which pages?)? No
Joomla! version: 3.2.2
PHP version: 5.3.3-7+squeeze16
MySQL version: (unknown)
Matukio version: 3.0.6
Direct link to the page that shows the issue: http://www.crewandstaff.nl/administrator/index.php?option=com_matukio&view=bookings&event_id=7 - let me know if you need user login details

Description of my issue:

I get the following error when unpublishing a user in Matukio > Bookings:

"Fatal error: Call to a member function publish() on a non-object in /public/sites/http://www.crewandstaff.nl/libraries/legacy/controller/admin.php on line 208"

what is going wrong? Please let me know because my client really need this option.

thanks in advance