Invalid argument supplied for foreach when sending newsletter

Invalid argument supplied for foreach() in C:\Program Files\Apache Group\Apache2\public_html\drupal-5.1\sites\all\modules\simplenews\simplenews.module on line 372.

simplenews_validate_taxonomy function assumes $taxonomy to be an array.
In the case I have - it isn't.

Have changed the code to the following.

function simplenews_validate_taxonomy($taxonomy) {
  $vid = _simplenews_get_vid();
  $result = db_query('SELECT tid FROM {term_data} WHERE vid = %d', $vid);
  while ($tid = db_fetch_object($result)) {
    $tids[] = $tid->tid;
  }
  $taxes = array();
  # ADDED is_array()
  if (is_array($taxonomy)) { 
  foreach ($taxonomy as $tax) {
    $taxes[] = $tax;
  }
  } else {
    $taxes[] = $taxonomy;
  }
  return array_intersect($tids, $taxes);
}