Make Contact Save work with Advanced User?

Hello,
It would be nice if this module could also work with Advanced User module: http://drupal.org/project/advuser
I tried to add a code in the module file, based on the code that was recently implemented for Author Contact to work with this Contact Save. Here is what I added:

  // Message generated by the ADVANCED USER MODULE
  if ($message['id'] == 'advuser_advance-user-mail') {
    $record = array(
      'mail_key' => $message['id'],
      'uid' => $user->uid ? $user->uid : db_result(db_query("SELECT uid FROM {users} WHERE mail = '%s'", $message['params']['site_mail'])),
      'name' => $message['params']['name'],
      'email' => $message['params']['site_mail'],
      'subject' => $message['params']['subject'],
      'recipients' => $message['to'],
      'message' => $message['params']['body'],
      'body' => implode("\n\n", $message['body']),
      'created' => time(),
    );
  }

but I'm getting an error:
implode() [function.implode]: Invalid arguments passed in /home/.../public_html/sites/all/modules/contact_save/contact_save.module