[Freeswitch-users] LUA session prevents channel's DOWN state

Hello I have a LUA script, what runs permamently and listen to callstate-change events. When i attached to a channel by session = freeswitch.session(uuid), it prevents the finish of the channel. (I get some variables from the channel.) It hangs up, the call finishes, but the channel exists until i shutdown FS. state=CS_REPORING and callstate=HANGUP until the end of times... How can i detach from the channel? thx rob