Waiting List duplicate registrations

Hi my client has a popular event which has gone into a waiting list.
People are adding themselves on to the waiting list several times. Can this be prevented? If there is a php solution i can code an override but would need to know which file to look at.

Hello

At the moment, we don't have option to prevent duplicate registration for waiting list

If you want to prevent it, you will need to edit code. I think the best place to customize code to add this additional logic is validateRegistrantEmail method in Register controller components/com_eventbooking/controller/register.php

Tuan