wp_die() gets called on post page and admin post edit.php page

https://github.com/humanmade/protected-embeds/blob/master/protected-embeds.php#L170

At this line `$wp->query_vars['protected-iframe']` won't be defined on edit.php page or any post request page. It is throwing wp_die() on those pages. I know it is used for redirect rule and iframe loading support but `parse_request` gets called on all page having post.