Map fields from Joomla user profile to Event booking participant registration

Sorry I meant
Sorry I meant

if (!isset($data))
{
$data= $lastName;
}

But of course this is perhaps not the best idea.
On my site I map a field from joomla user to eventbooking last_name.
But I think that the mapping happens before this check in the base.php, so it is overwritten.

The code you wrote earlier does not look right to me. Maybe you can submit a support ticket sending us super user account of your site so that I can check your setup before we can discuss further about this ?

Regards,

Tuan