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java.lang.NullPointerException: 	at java.util.concurrent.ConcurrentHashMap.hash(ConcurrentHashMap.java:333)	at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:988)	at org.jivesoftware.smack.Roster.getPresence(Roster.java:469)	at org.jivesoftware.spark.PresenceManager.getPresence(PresenceManager.java:117)	at org.jivesoftware.spark.ui.conferences.GroupChatParticipantList.addParticipant(GroupChatParticipantList.java:354)	at org.jivesoftware.spark.ui.conferences.GroupChatParticipantList$3$1.run(GroupChatParticipantList.java:218)	at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:312)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:745)	at java.awt.EventQueue.access$300(EventQueue.java:103)	at java.awt.EventQueue$3.run(EventQueue.java:706)	at java.awt.EventQueue$3.run(EventQueue.java:704)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:715)	at org.jivesoftware.sparkimpl.plugin.idle.UserIdlePlugin$1.dispatchEvent(UserIdlePlugin.java:182)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:242)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:161)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:150)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:146)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)