alt login deleted when updating user profile

I use the profile module. When I update a user data from another tab of the edit user page, the alt login is reset.
I use this version of alt_login : v 1.1.2.2 2006/11/19 20:41:03
It's because the alt login is deleted on line 109. I added a condition on the else statement. Here is the new function I came up with to fix that:

function _alt_login_update($uid, &$edit) {
  $alt_login = $edit['alt_login'];

  // Only keep a database entry if an alternate login has been specified.
  if ($alt_login != "") {
    if (db_result(db_query('SELECT uid FROM {alt_login} WHERE uid = %d', $uid))) {
      db_query("UPDATE {alt_login} SET alt_login = '%s' WHERE uid = %d", $alt_login, $uid);
    }
    else {
      db_query("INSERT INTO {alt_login} (uid, alt_login) VALUES (%d, '%s')", $uid, $alt_login);
    }
  }
  elseif (isset($alt_login) && $alt_login == "") {
    db_query('DELETE FROM {alt_login} WHERE uid = %d', $uid);
  }
  // Don't want this saved in the data column of the users table, so unset.
  unset($edit['alt_login']);
}