link flags address on home pages not working

Hi,
I’ve got wordpress multisite 3.5
I’ve inserted code function og Multilingual Press in my header php
by adding
<?php echo mlp_show_linked_elements( array( 'link_text' => 'flag', 'show_current_blog' => TRUE ) ); ?>
The links translations of all pages and posts go very well, but concerning the home pages they do not work.
The result is something like that
No Results Found
The page you requested could not be found. Try refining your search, or use the navigation above to locate the post.
But I see the “home link menu in the page and if a click on it send me on the right home page

Someone can help me, please?