java.lang.NullPointerException: This exception has no message.

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java.lang.NullPointerException:
at org.jivesoftware.messenger.SessionManager.getSession(SessionManager.java:611)
at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:87)
at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(PresenceUpdateHandler.java:135)
at org.jivesoftware.messenger.SessionManager$ClientSessionListener.onConnectionClose(SessionManager.java:966)
at org.jivesoftware.messenger.spi.BasicConnection.notifyCloseListeners(BasicConnection.java:58)
at org.jivesoftware.messenger.net.SocketConnection.close(SocketConnection.java:158)
at org.jivesoftware.messenger.SessionManager.stop(SessionManager.java:1075)
at org.jivesoftware.messenger.XMPPServer.shutdownServer(XMPPServer.java:586)
at org.jivesoftware.messenger.XMPPServer.stop(XMPPServer.java:357)
at org.jivesoftware.util.WebManager.stop(WebManager.java:146)
at org.jivesoftware.messenger.admin.server_002dstopped_jsp._jspService(server_002dstopped_jsp.java:149)

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