PHP notice in latest update (1.0.8)

With debug turned on, there’s a PHP notice appearing on every page:

Notice: Undefined variable: id in /var/www/l1/syl/wp-content/plugins/before-after-image-compare/plugin.php on line 28

I think you can fix this by changing that line from:

$id = (!$id) ? get_the_ID() : $id;

to this:

$id = empty($id) ? get_the_ID() : $id;