I'm running into an issue for event registrations where multiple participants can be registered. The first registrant goes through fine, however, when submitting registration #2, the following error occurs:
Call to protected method CRM_Event_Form_Registration_Register::getRegistrationContactID() from context 'CRM_Event_Form_Registration_AdditionalParticipant'
I am running Joomla 3.7.2 and Civicrm 4.7.19
Thoughts on where to go?