Archived channel standup exception

[com4]

2017-07-12 10:00:00,001 [INFO] StandUpPlugin: Executing standup for channel #data_arch      
2017-07-12 10:00:00,001 [INFO] StandUpPlugin: Executing standup for channel #warmachine-dev                                                                                                                                                                                                                                                                                                                                                                                                                               
2017-07-12 10:00:00,002 [DEBUG] SlackWS: Gathering list of users for channel G3NCGRNLV from: https://slack.com/api/groups.info?channel=G3NCGRNLV&token=xoxb-#######################                                                                                                              
2017-07-12 10:00:00,119 [ERROR] asyncio: Task exception was never retrieved
future: <Task finished coro=<StandUpPlugin.start_standup() done, defined at /home/com4/warmachine-ng/warmachine/addons/standup.py:307> exception=KeyError('group',)>                                                                                                                                          
Traceback (most recent call last):
  File "/usr/lib/python3.5/asyncio/tasks.py", line 239, in _step
    result = coro.send(None)
  File "/home/com4/warmachine-ng/warmachine/addons/standup.py", line 312, in start_standup                                                                                                                                                                                                                    
    users = connection.get_users_by_channel(channel)
  File "/home/com4/warmachine-ng/warmachine/connections/slack.py", line 340, in get_users_by_channel
    for u_id in r[key]['members']:
KeyError: 'group'

Exception occurs when a standup is scheduled for an archived channel?