WordPress database error: [Column 'fullname' cannot be null]INSERT INTO `wp_events_attendees` (`fullname`, `email`, `mobile`, `city`, `address`, `eventid`, `price`, `totalguests`, `totalamount`, `paymentstatus`, `paymentreference`, `eventreference`, `registereddate`) VALUES (NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL)