[Plugin: Just Custom Fields] Blank page after update Uploadmedia

Sometimes when you do some operations with Uploadmedia component field and then update the post/page you got blank screen.
If you reload the page all is good again

TODO:
1) find steps to reproduce this bug (it appears very very seldom and hard to find it and fix)
2) fix bug 🙂

http://wordpress.org/extend/plugins/just-custom-fields/