aa-genprof fails on disabled profile

Hi,

I'm following the tutorial at https://ubuntuforums.org/showthread.php?t=1008906&p=6353894#post6353894 based on my Ubuntu 18.10 as-is presently.

When doing sudo aa-genprof firefox, I get the following error message:

Traceback (most recent call last):
  File "/usr/sbin/aa-genprof", line 110, in <module>
    apparmor.autodep(program)
  File "/usr/lib/python3/dist-packages/apparmor/aa.py", line 590, in autodep
    profile_data = get_profile(pname)
  File "/usr/lib/python3/dist-packages/apparmor/aa.py", line 500, in get_profile
    inactive_profile[prof_name][prof_name].pop('filename')
AttributeError: 'ProfileStorage' object has no attribute 'pop'

So much as I can see, I have a usr.bin.firefox profile both in apparmor.d and in the disable directory.
The full trace is below:
----

AttributeError
Python 3.6.7: /usr/bin/python3
Tue Mar 12 18:23:07 2019

A problem occurred in a Python script. Here is the sequence of
function calls leading up to the error, in the order they occurred.

 /usr/sbin/aa-genprof in <module>()
  105
  106 profile_filename = apparmor.get_profile_filename(program)
  107 if os.path.exists(profile_filename):
  108 apparmor.helpers[program] = apparmor.get_profile_flags(profile_filename, program)
  109 else:
  110 apparmor.autodep(program)
  111 apparmor.helpers[program] = 'enforce'
  112
  113 if apparmor.helpers[program] == 'enforce':
  114 apparmor.complain(program)
apparmor = <module 'apparmor.aa' from '/usr/lib/python3/dist-packages/apparmor/aa.py'>
apparmor.autodep = <function autodep>
program = '/usr/lib/firefox/firefox.sh'

 /usr/lib/python3/dist-packages/apparmor/aa.py in autodep(bin_name='/usr/lib/firefox/firefox.sh', pname='/usr/lib/firefox/firefox.sh')
  585 else:
  586 bin_full = pname # for named profiles
  587
  588 pname = bin_full
  589 read_inactive_profiles()
  590 profile_data = get_profile(pname)
  591 # Create a new profile if no existing profile
  592 if not profile_data:
  593 profile_data = create_new_profile(pname)
  594 file = get_profile_filename(pname)
profile_data undefined
global get_profile = <function get_profile>
pname = '/usr/lib/firefox/firefox.sh'

 /usr/lib/python3/dist-packages/apparmor/aa.py in get_profile(prof_name='/usr/lib/firefox/firefox.sh')
  495 aaui.UI_Important(_('WARNING: Error fetching profiles from the repository'))
  496 inactive_profile = get_inactive_profile(prof_name)
  497 if inactive_profile:
  498 uname = 'Inactive local profile for %s' % prof_name
  499 inactive_profile[prof_name][prof_name]['flags'] = 'complain'
  500 inactive_profile[prof_name][prof_name].pop('filename')
  501 profile_hash[uname]['username'] = uname
  502 profile_hash[uname]['profile_type'] = 'INACTIVE_LOCAL'
  503 profile_hash[uname]['profile'] = serialize_profile(inactive_profile[prof_name], prof_name, None)
  504 profile_hash[uname]['profile_data'] = inactive_profile
inactive_profile = {'/usr/lib/firefox/firefox.sh': defaultdict(<function hasher at 0x7f8e214ad9d8>,...torage.ProfileStorage object at 0x7f8e2088bc18>})}
prof_name = '/usr/lib/firefox/firefox.sh'
].pop undefined
AttributeError: 'ProfileStorage' object has no attribute 'pop'
    __cause__ = None
    __class__ = <class 'AttributeError'>
    __context__ = None
    __delattr__ = <method-wrapper '__delattr__' of AttributeError object>
    __dict__ = {}
    __dir__ = <built-in method __dir__ of AttributeError object>
    __doc__ = 'Attribute not found.'
    __eq__ = <method-wrapper '__eq__' of AttributeError object>
    __format__ = <built-in method __format__ of AttributeError object>
    __ge__ = <method-wrapper '__ge__' of AttributeError object>
    __getattribute__ = <method-wrapper '__getattribute__' of AttributeError object>
    __gt__ = <method-wrapper '__gt__' of AttributeError object>
    __hash__ = <method-wrapper '__hash__' of AttributeError object>
    __init__ = <method-wrapper '__init__' of AttributeError object>
    __init_subclass__ = <built-in method __init_subclass__ of type object>
    __le__ = <method-wrapper '__le__' of AttributeError object>
    __lt__ = <method-wrapper '__lt__' of AttributeError object>
    __ne__ = <method-wrapper '__ne__' of AttributeError object>
    __new__ = <built-in method __new__ of type object>
    __reduce__ = <built-in method __reduce__ of AttributeError object>
    __reduce_ex__ = <built-in method __reduce_ex__ of AttributeError object>
    __repr__ = <method-wrapper '__repr__' of AttributeError object>
    __setattr__ = <method-wrapper '__setattr__' of AttributeError object>
    __setstate__ = <built-in method __setstate__ of AttributeError object>
    __sizeof__ = <built-in method __sizeof__ of AttributeError object>
    __str__ = <method-wrapper '__str__' of AttributeError object>
    __subclasshook__ = <built-in method __subclasshook__ of type object>
    __suppress_context__ = False
    __traceback__ = <traceback object>
    args = ("'ProfileStorage' object has no attribute 'pop'",)
    with_traceback = <built-in method with_traceback of AttributeError object>

The above is a description of an error in a Python program. Here is
the original traceback:

Traceback (most recent call last):
  File "/usr/sbin/aa-genprof", line 110, in <module>
    apparmor.autodep(program)
  File "/usr/lib/python3/dist-packages/apparmor/aa.py", line 590, in autodep
    profile_data = get_profile(pname)
  File "/usr/lib/python3/dist-packages/apparmor/aa.py", line 500, in get_profile
    inactive_profile[prof_name][prof_name].pop('filename')
AttributeError: 'ProfileStorage' object has no attribute 'pop'