Limit Ticket Availability

/**
This snippet is already working in the latest EM version
allowing tickets to limit per user role
*/
function em_mod_ticket_available($result,$EM_Ticket){
 global $current_user;
 $user_roles = $current_user->roles;
 $user_role = array_shift($user_roles);
 if ( $EM_Ticket->ticket_members && $EM_Ticket->ticket_name == 'General Admin' ){
  if ( $user_role == 'administrator' ){
   return false;
  }
 }
 return $result;
}
add_filter('em_ticket_is_available','em_mod_ticket_available',10,2);