$post = null using shortcode in custom loop

I am using the shortcode to generate social sharing links in a custom post loop and am dynamically passing in the urls (see my previous post support ticket here). This is throwing php notices every post as in super-socializer/inc/social_sharing.php the_champ_prepare_sharing_html() is declaring $post as global. In this use case $post = null. This can be fixed by adding

 if (NULL === $post) {
        $post = get_post($shareCountTransientId);
} 

on line 14.