aa-complain crashed with apparmor.common.AppArmorException in store_list_var(): 'An existing variable redefined: @{MOZ_LIBDIR}'

Starting with the below default apparmor status, executed the following via a terminal and got crash:
sudo aa-complain /usr/bin/evince /usr/bin/evince-previewer
Setting /usr/bin/evince to complain mode.
Traceback (most recent call last):
  File "/usr/sbin/aa-complain", line 30, in <module>
    tool.cmd_complain()
  File "/usr/lib/python3/dist-packages/apparmor/tools.py", line 171, in cmd_complain
    apparmor.read_profiles()
  File "/usr/lib/python3/dist-packages/apparmor/aa.py", line 2564, in read_profiles
    read_profile(profile_dir + '/' + file, True)
  File "/usr/lib/python3/dist-packages/apparmor/aa.py", line 2590, in read_profile
    profile_data = parse_profile_data(data, file, 0)
  File "/usr/lib/python3/dist-packages/apparmor/aa.py", line 2843, in parse_profile_data
    store_list_var(filelist[file]['lvar'], list_var, value, var_operation)
  File "/usr/lib/python3/dist-packages/apparmor/aa.py", line 3274, in store_list_var
    raise AppArmorException(_('An existing variable redefined: %s') % list_var)
apparmor.common.AppArmorException: 'An existing variable redefined: @{MOZ_LIBDIR}'

sudo apparmor_status
apparmor module is loaded.
20 profiles are loaded.
20 profiles are in enforce mode.
   /sbin/dhclient
   /usr/bin/evince
   /usr/bin/evince-previewer
   /usr/bin/evince-previewer//sanitized_helper
   /usr/bin/evince-thumbnailer
   /usr/bin/evince-thumbnailer//sanitized_helper
   /usr/bin/evince//sanitized_helper
   /usr/lib/NetworkManager/nm-dhcp-client.action
   /usr/lib/connman/scripts/dhclient-script
   /usr/lib/cups/backend/cups-pdf
   /usr/lib/lightdm/lightdm-guest-session
   /usr/lib/lightdm/lightdm-guest-session//chromium
   /usr/lib/telepathy/mission-control-5
   /usr/lib/telepathy/telepathy-*
   /usr/lib/telepathy/telepathy-*//pxgsettings
   /usr/lib/telepathy/telepathy-*//sanitized_helper
   /usr/lib/telepathy/telepathy-ofono
   /usr/sbin/cups-browsed
   /usr/sbin/cupsd
   /usr/sbin/tcpdump
0 profiles are in complain mode.
3 processes have profiles defined.
3 processes are in enforce mode.
   /usr/lib/telepathy/mission-control-5 (2818)
   /usr/sbin/cups-browsed (1422)
   /usr/sbin/cupsd (3049)
0 processes are in complain mode.
0 processes are unconfined but have a profile defined.

However, executing the following did not crash:
sudo aa-complain /usr/bin/evince-previewer
Profile for /usr/bin/evince-previewer not found, skipping

Not sure how no profile was found when there clearly was one as per the status.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: apparmor-utils 2.8.95~2430-0ubuntu5.1
ProcVersionSignature: Ubuntu 3.16.0-28.37~14.04.1-generic 3.16.7-ckt1
Uname: Linux 3.16.0-28-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.6
Architecture: amd64
Date: Tue Dec 16 14:27:47 2014
ExecutablePath: /usr/sbin/aa-complain
InstallationDate: Installed on 2014-06-21 (177 days ago)
InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
InterpreterPath: /usr/bin/python3.4
ProcCmdline: /usr/bin/python3 /usr/sbin/aa-complain /usr/bin/evince /usr/bin/evince-previewer
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 LANGUAGE=en_US
 SHELL=/bin/bash
ProcKernelCmdline: BOOT_IMAGE=/boot/vmlinuz-3.16.0-28-generic root=UUID=a2db89ed-d599-4138-8838-0b950b6c3fbb ro quiet splash crashkernel=384M-:128M vt.handoff=7
PythonArgs: ['/usr/sbin/aa-complain', '/usr/bin/evince', '/usr/bin/evince-previewer']
SourcePackage: apparmor
Syslog:

Title: aa-complain crashed with apparmor.common.AppArmorException in store_list_var(): 'An existing variable redefined: @{MOZ_LIBDIR}'
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: