The wp
action hook fires pretty early, before the $post
object is set. I would suggest using the appropriate hook wp_enqueue_scripts
instead, and amending your code to:
function profolio_localize_script () {
if ( is_singular( 'my-gallery' ) ) {
$layoutType = get_post_meta( get_queried_object_id(), 'gallery_layout', true );
// Rest of code
}
}