Problem with load roster when using shared group from AD

when I make shared group by selecting Show group in all users’’ rosters.

user having problem with load roster when client logon

005.08.26 12:22:31 org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(PresenceUpdateH andler.java:130) Internal server error

java.lang.NullPointerException

at java.util.TreeMap.compare(Unknown Source)

at java.util.TreeMap.getEntry(Unknown Source)

at java.util.TreeMap.containsKey(Unknown Source)

at java.util.TreeSet.contains(Unknown Source)

at org.jivesoftware.messenger.group.Group.isUser(Group.java:191)

at org.jivesoftware.messenger.roster.Roster.