[TYPO3-project-seminars] Fatal error when unregistering because of a undefined function - solution?

[Bernd Schönbach]

Hi Greg,

this is a Bug in the seminars extension I filed this bug in our bug
tracker (https://bugs.oliverklee.com/show_bug.cgi?id=2576), we will be
fixing this soon.
If you want your bugs fixed as quickly as possible I would recommend you
the seminars bug flatrate. If you are interested in this flatrate
contact Oliver via typo3-coding at oliverklee.de

Best regards
Bernd