<article id="post-<?php the_ID(); ?>" <?php post_class(); ?>>
<header class="entry-header">
- <?php if ( has_post_thumbnail() && ! post_password_required() ) : ?>
+ <?php if ( has_post_thumbnail() && ! post_password_required() && ! is_attachment() ) : ?>
<div class="entry-thumbnail">
<?php the_post_thumbnail(); ?>
</div>