Featured Image Link not working

Hi there,

I have trouble on a website with the featured image – it does not link to the main post page anymore. I cannot remember whether it did before, but I think so. Anyway, the owner of the website asked me about this issue and I could not solve it. I hope someone here might help me. Below you’ll find the code from the function.php and the website is built on Cudazi Mono theme (if it makes any difference).

// Get Featured Image + Link
	function cudazi_get_featured_image( $img_size, $fallback ) {
		global $post;		

		$cudazi_post_hide_featured_single = get_post_meta($post->ID, 'cudazi_post_hide_featured_single', true);
		if ( is_single() && $cudazi_post_hide_featured_single ) {
			return false;
		}

		if ( has_post_thumbnail() ) {
			$featured_image_link_to = get_post_meta($post->ID, 'featured_image_link_to', true);
			$featured_image_link_to_url = get_post_meta($post->ID, 'featured_image_link_to_url', true);
			if ( $featured_image_link_to_url ) {
				$featured_image_link = $featured_image_link_to_url;
			}else{
				if ( $featured_image_link_to == 'post' ) {
					$featured_image_link = get_permalink();
				}else if ( $featured_image_link_to == 'image' || !$featured_image_link_to ) {
					$featured_image_link = wp_get_attachment_image_src( get_post_thumbnail_id( $post->ID ), 'full' );
					$featured_image_link = $featured_image_link[0];
				}
			} // end if url set
			$featured_image = get_the_post_thumbnail($post->ID, $img_size, array( 'class' => '' ));
		}else{ // no thumbnail set
			$featured_image_link = get_permalink();
			$featured_image = $fallback;
		} // end if has featured image				

		if ( has_post_thumbnail() ) {
			return "<div class='post-thumbnail'><a href='" . $featured_image_link . "'>" . $featured_image . "</a></div>";
		}
	}

Thanks in advance.