CSS Problems in 404's

Lockdown WP Admin is great plugin. I really love it.
There is some problem I am encountering, that I want your attention to look at, I’ve activated Hide Login and used custom login URL and when visiting on http://autospace.co/wp-admin or /wp-login.php the background of #header is not loading (it is loading in else 404 pages), it is because theme have option to add custom header and it puts its variable value in page source, as you can see in line 111 or 112 this <style type=”text/css”>#header{background:url(blah..blah) no-repeat;}</style>
But this style tag is appearing in these wp-admin directories 404 pages, making page look ugly.

Site URL: http://autospace.co/ and Streamline child theme powered by Genesis Framework.

Can you please take a look into it?

-Aditya Pandey

PS: I posted here too to make a record on wordpress, so that other users may conclude solution, if I get one.

http://wordpress.org/extend/plugins/lockdown-wp-admin/