On a channel I mod for I noticed the !game command cause nightbot to return
Nightbot: username → undefined
I tried on my twitch channel and got the same thing. I have tried logging out of the nightbot dashboard and twitch and logging back in but it still does not work. Other commands work as I was able to do the !commands comand.
Did you wait for a couple minutes before logging back in?
For the channel you mod for, the streamer will have to log out, wait a couple minutes, and then log back in.