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java.lang.NullPointerException: 	at java.util.Hashtable.get(	at weblogic.servlet.internal.HttpServer.unregister(	at weblogic.servlet.internal.session.ReplicatedSessionData.invalidate(	at weblogic.servlet.internal.session.ReplicatedSessionContext.invalidateSession(	at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.invalidateSessions(	at weblogic.servlet.internal.session.SessionContext$SessionInvalidator.trigger(	at weblogic.time.common.internal.ScheduledTrigger.executeLocally(