gnome-language-selector crash

$ gnome-language-selector

** (gnome-language-selector:1399): WARNING **: Couldn't connect to accessibility bus: Failed to connect to socket /tmp/dbus-xI66a0xm5W: Connection refused
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Fontconfig warning: ignoring C.UTF-8: not a valid language tag
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 175, in activate_name_owner
    return self.get_name_owner(bus_name)
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 361, in get_name_owner
    's', (bus_name,), **keywords)
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NameHasNoOwner: Could not get owner of name 'org.freedesktop.Accounts': no such name

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/LanguageSelector/LocaleInfo.py", line 242, in getUserDefaultLanguage
    obj = bus.get_object('org.freedesktop.Accounts', '/org/freedesktop/Accounts')
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 241, in get_object
    follow_name_owner_changes=follow_name_owner_changes)
  File "/usr/lib/python3/dist-packages/dbus/proxies.py", line 248, in __init__
    self._named_service = conn.activate_name_owner(bus_name)
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 180, in activate_name_owner
    self.start_service_by_name(bus_name)
  File "/usr/lib/python3/dist-packages/dbus/bus.py", line 278, in start_service_by_name
    'su', (bus_name, flags)))
  File "/usr/lib/python3/dist-packages/dbus/connection.py", line 651, in call_blocking
    message, timeout)
dbus.exceptions.DBusException: org.freedesktop.DBus.Error.Spawn.ExecFailed: Failed to execute program /usr/lib/dbus-1.0/dbus-daemon-launch-helper: Success

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/usr/bin/gnome-language-selector", line 22, in on_activate
    options=options)
  File "/usr/lib/python3/dist-packages/LanguageSelector/gtk/GtkLanguageSelector.py", line 199, in __init__
    self.updateLocaleChooserCombo()
  File "/usr/lib/python3/dist-packages/LanguageSelector/gtk/GtkLanguageSelector.py", line 54, in wrapper
    res = f(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/LanguageSelector/gtk/GtkLanguageSelector.py", line 814, in updateLocaleChooserCombo
    (defaultLangCode, languageString) = self._localeinfo.getUserDefaultLanguage()
  File "/usr/lib/python3/dist-packages/LanguageSelector/LocaleInfo.py", line 254, in getUserDefaultLanguage
    warnings.warn(msg.args[0].encode('UTF-8'))
TypeError: can't use a string pattern on a bytes-like object