If you're in Any Org context, the hostgroups helper in Katello which adds the Lifecycle Environment field bombs out because it tries to call id on nil. Patch incoming.
Created from redmine issue http://projects.theforeman.org/issues/6256
VERIFIED
This was delivered with Satellite 6.0 which was released on 10 September 2014.
*** Bug 1132133 has been marked as a duplicate of this bug. ***