Sending first image from posts not works

There is a bug in wpmu-dev-facebook.php in this code:

// If we're still here, post has no featured image.
// Fetch the first one.
$html = get_the_content();

$html do not contains content of the post.

I have change this code to

// If we're still here, post has no featured image.
// Fetch the first one.
if ($id) {
$post = get_post($id);
$html = $post->post_content;
$html = apply_filters( 'the_content', $html );
}
else {
$html = get_the_content();
$html = apply_filters( 'the_content', $html );
}

and now it works!

(sorry for my English)