backend#getChannelGroups() returns ServerGroups but no ChannelGroups

[essem]

with the provided code i get only servergroups but not a single channelgroup.
sinusbot version: 0.13.37-9791176

        backend.getChannelGroups().forEach(function(group) {
            engine.log(group);
        });

exampleoutput:

ChannelGroup{ ID: <6>, Name: <Administrator> }
ChannelGroup{ ID: <7>, Name: <Normal> }
ChannelGroup{ ID: <8>, Name: <User> }