Featured Image Stopped Working when Front Page Set to Static

Hello all,

I’ve been working on a theme where the featured image from the latest post appeared above the post on the front page. I then updated my front page to a static page (same code exactly), and now the featured image isn’t showing – but the placeholderhead.jpg is showing. I’d like to get the featured image working again.

Here’s the code in question:

<?php if (has_post_thumbnail( $post->ID ) ): ?>
<?php $image = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'single-post-thumbnail' );
$image = $image[0]; ?>
<?php else :
$image = get_bloginfo( 'stylesheet_directory') . '/assets/img/placeholderhead.jpg'; ?>
<?php endif; ?>
...
<?php echo $image; ?>

I’d like to be able to show the latest post featured image again… but I’m not sure what I did to make it stop working.

Please help!