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java.lang.NullPointerException: 	at java.util.concurrent.ConcurrentHashMap.hash(	at java.util.concurrent.ConcurrentHashMap.get(	at org.jivesoftware.smack.Roster.getPresence(	at org.jivesoftware.spark.PresenceManager.getPresence(	at org.jivesoftware.spark.ui.conferences.GroupChatParticipantList.addParticipant(	at org.jivesoftware.spark.ui.conferences.GroupChatParticipantList$3$	at java.awt.event.InvocationEvent.dispatch(	at java.awt.EventQueue.dispatchEventImpl(	at java.awt.EventQueue.access$300(	at java.awt.EventQueue$	at java.awt.EventQueue$	at Method)	at$1.doIntersectionPrivilege(	at java.awt.EventQueue.dispatchEvent(	at org.jivesoftware.sparkimpl.plugin.idle.UserIdlePlugin$1.dispatchEvent(	at java.awt.EventDispatchThread.pumpOneEventForFilters(	at java.awt.EventDispatchThread.pumpEventsForFilter(	at java.awt.EventDispatchThread.pumpEventsForHierarchy(	at java.awt.EventDispatchThread.pumpEvents(	at java.awt.EventDispatchThread.pumpEvents(