NAMES returning unknown command

The log is in order. What do you mean it seems I’m joining before the ACK of the CAP? I join the channel after the ACK;

DEBUG:irc.client:FROM SERVER: :tmi.twitch.tv CAP * ACK :twitch.tv/membership
DEBUG:irc.client:TO SERVER: JOIN #craz_killa

The channel had under 1000 people.