post_type ) { return; } if ( $prev_post && has_post_thumbnail( $prev_post->ID ) ) { $prev_thumb = ''.get_the_post_thumbnail($prev_post->ID, 'thumbnail').''; } if ( $next_post && has_post_thumbnail( $next_post->ID ) ) { $next_thumb = ''.get_the_post_thumbnail($next_post->ID, 'thumbnail').''; } ?>