Registration on some events gives SQL error

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '1,5) ORDER BY ordering LIMIT 1' at line 3

www.lichtstrahl.org/component/eventbooki...eiterin-2?Itemid=631

when clicking on register get the error above. Some other events work fine.
Already tried Tools - fix Database and purge URLs
Please help !

Eventbooking 3.0.3
mySql 5.5.57
php 5.6.31

Hi

Please submit a support ticket sending us:

1. Super admin account of the site
2. Link to the page

Tell us what event we can register to see the error

We are going to check to see why the issue happens and get it sorted

Regards,

Tuan

Thanks. I submit a ticket # 65277

Thanks. We received the ticket. Will check and get back to you soon

Tuan