Newbie: What does this mean (Wrong NAS port ID)?

Hi all. Im using freeradius 1.1.7 with Proxim AP4000 and it works. But i get this in my syslog. Error: rlm_radutmp: Logout entry for NAS ap-serverummet port 9 has wrong ID What does this mean? Can i ignore it? Can't really find anything useful on the net.. client-conf: client 10.0.5.191 { secret = xxx shortname = ap-serverummet nastype = other # localhost isn't usually a NAS... } thx. p