Call to 3rd party autocomplete function have wrong parametres

Function nodequeue_api_autocomplete.

<?php
  // Call to the API.
  $function = $queue->owner . "_nodequeue_autocomplete";
  if (function_exists($function)) {
    return $function($queue, $subqueue, $string, $where, $where_args);
  }

?>

But $where is not defined and $where_args - is allways empty.