File "/Users/Projects/github/tracs/tracs/group.py", line 46, in group_activities
if force or confirm_grouping( ctx, g ):
File "/Users/Projects/github/tracs/tracs/group.py", line 88, in confirm_grouping
names = sorted( list( set( [member.name for member in group.members] ) ) )
TypeError: '<' not supported between instances of 'str' and 'NoneType'