Create user, activate mail fails

After creating a user on a mail enabled provider, I can't simply switch mail on.

➜  bitmask-0.10.0 ./bitmask user create kwadronaut@provider --invitecode 4blabla-blabla
➜  bitmask-0.10.0 ./bitmask user list
kwadronaut@provider
➜  bitmask-0.10.0 ./bitmask mail status
status      off
keymanager  off
smtp        on
incoming    off
imap        on
keys        None
unread      None
➜  bitmask-0.10.0 ./bitmask mail enable
ERROR: 'NoneType' object is not iterable