Comments are gone after query_posts in sidebar

Hi all,

My layout:
-header
-content
—>post
—>sidebar
—>comments
-footer

Everything works fine until I decided to add some stuff in the sidebar, but now my comments won’t appear anymore.

The tings I’ve added in the sidebar is this:

<?php
$postslist = query_posts('category_name=News&orderby=post_date&posts_per_page=4');
...

So my <?php comments_template(); ?> won’t show the comments anymore.

Is there a way to get them back? Add something to <?php comments_template(); ?> ???

Thanks in advance