Related posts code making problem for comment

I am putting code in my single.php after post for show related posts. But after put codes codes works fine but comment making problem. It means when someone enter the comments page goes on another post and comment also.

I am putting this code after post code:

<?php
$tags = wp_get_post_tags($post->ID);
if ($tags) {
$tag_ids = array();
foreach($tags as $individual_tag) $tag_ids[] = $individual_tag->term_id;

$args=array(
‘tag__in’ => $tag_ids,
‘post__not_in’ => array($post->ID),
‘showposts’=>5, // Number of related posts that will be shown.
‘caller_get_posts’=>1
);
$my_query = new wp_query($args);
if( $my_query->have_posts() ) {
echo ‘<h3>Related Posts</h3>

‘;
while ($my_query->have_posts()) {
$my_query->the_post();
?>

• ” rel=”bookmark” title=”Permanent Link to <?php the_title_attribute(); ?>”><?php the_title(); ?>

<?php
}
echo ‘
‘;
}
}
?>