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

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at org.jivesoftware.messenger.SessionManager.getSession(
at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(
at org.jivesoftware.messenger.handler.PresenceUpdateHandler.process(
at org.jivesoftware.messenger.SessionManager$ClientSessionListener.onConnectionClose(
at org.jivesoftware.messenger.spi.BasicConnection.notifyCloseListeners(
at org.jivesoftware.messenger.SessionManager.stop(
at org.jivesoftware.messenger.XMPPServer.shutdownServer(
at org.jivesoftware.messenger.XMPPServer.stop(
at org.jivesoftware.util.WebManager.stop(
at org.jivesoftware.messenger.admin.server_002dstopped_jsp._jspService(

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