Spaces in membership title

I attempted to make a membership type named "Membership - Business"

When I tried to associate it with an account type I received errors stating that the account type is invalid.

This was not due to an invalid content type but rather when it attempted to validate the submission having a key name
$form['Membership - Business'] failed

I suggest asking for a machine readable name and a title and use the machine readable for the keys in the variable nf_registration_mod_memberships.

I worked around this by just giving the title of the membership type 'Membership-Business'

Thanks