Hipmost Private List gives NoMethodError

[STSWarren]

Ruby Version:
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux-gnu]

Command:
./hipmost-master/exe/hipmost -v private list

Error:
Traceback (most recent call last):
10: from ./hipmost-master/exe/hipmost:48:in <main>' 9: from /home/sa/work/hipmost-master/lib/hipmost.rb:16:in run'
8: from /home/sa/work/hipmost-master/lib/hipmost/cmds/private.rb:19:in run' 7: from /home/sa/work/hipmost-master/lib/hipmost/cmds/private.rb:24:in list'
6: from /home/sa/work/hipmost-master/lib/hipmost/hipchat.rb:21:in direct_channels' 5: from /home/sa/work/hipmost-master/lib/hipmost/hipchat.rb:21:in flat_map'
4: from /home/sa/work/hipmost-master/lib/hipmost/hipchat.rb:21:in each' 3: from /home/sa/work/hipmost-master/lib/hipmost/hipchat.rb:23:in block in direct_channels'
2: from /home/sa/work/hipmost-master/lib/hipmost/hipchat.rb:23:in map' 1: from /home/sa/work/hipmost-master/lib/hipmost/hipchat.rb:23:in each'
/home/sa/work/hipmost-master/lib/hipmost/hipchat.rb:30:in block (2 levels) in direct_channels': undefined method []' for nil:NilClass (NoMethodError)

Comment:
When I run the command "./hipmost-master/exe/hipmost -v public list" or "./hipmost-master/exe/hipmost -v public import "HipchatRoom" "Channel":"MattermostRoom"" it works fine and executes without problem. I have been trying to fix it myself but so far to no avail. Any help would be appreciated.