Taxonomy second page not display error 404

Hy guys, the second page of a taxonomy do not display, i get an error 404

<?php global $wp_query;
$args = array_merge( $wp_query->query, array( 'post_type' => 'clip'  ) );
query_posts( $args ); ?>

<div class="nav">
<?php if(function_exists('wp_paginate')) {wp_paginate();} ?>
</div>

<?php is_tag(); ?>
<?php if (have_posts()) : ?>
<?php while (have_posts()) : the_post(); ?>

Anny solution?