NetServer::SendMsg Players Getting Kicked

[Liqu1dShadow]

12:05:22 NetServer::SendMsg: cannot find channel #166xxxxx40, users.card=4
12:05:22 NetServer: users.get failed when sending to 166xxxxx40
12:05:22 Message not sent - error 0, message ID = ffffffff, to 16xxxxx40 (Fritz Smith)
12:05:22 NetServer::SendMsg: cannot find channel #166xxxxx40, users.card=4
12:05:22 NetServer: users.get failed when sending to 166xxxxx40
12:05:22 Message not sent - error 0, message ID = ffffffff, to 1665973140 (Fritz Smith)
12:05:22 "<infiSTAR.de> ---PlayerDisconnected: Fritz Smith(765xxxxxxxxxxx510)"

 

 

Any idea what would cause this or where to start looking?

 

Thanks in advance