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java.lang.NullPointerException: 	at co.paralleluniverse.strands.Strand.park(Strand.java:493)	at co.paralleluniverse.strands.ConditionSynchronizer.await(ConditionSynchronizer.java:54)	at co.paralleluniverse.actors.Mailbox.await(Mailbox.java:90)	at co.paralleluniverse.actors.SelectiveReceiveHelper.receive(SelectiveReceiveHelper.java:141)	at co.paralleluniverse.actors.behaviors.RequestReplyHelper.call(RequestReplyHelper.java:174)	at co.paralleluniverse.actors.behaviors.RequestReplyHelper.call(RequestReplyHelper.java:112)	at service.actor.GalaxyTranceiver.writeBuffers(GalaxyTranceiver.java:68)	at service.actor.GalaxyTranceiver.transceive(GalaxyTranceiver.java:57)	at org.apache.avro.ipc.Transceiver.transceive(Transceiver.java:72)	at org.apache.avro.ipc.Requestor.request(Requestor.java:147)	at org.apache.avro.ipc.Requestor.request(Requestor.java:101)	at org.apache.avro.ipc.specific.SpecificRequestor.invoke(SpecificRequestor.java:88)	at com.sun.proxy.$Proxy17.spawnSession(Unknown Source)	at lobby.actors.SessionRegistry.start(SessionRegistry.java:137)	at tests.LobbyTest$2.apply(LobbyTest.java:125)	at tests.LobbyTest$2.apply(LobbyTest.java:1)	at lobby.actors.SessionRegistry$Action.process(SessionRegistry.java:125)	at lobby.actors.SessionRegistry.doRun(SessionRegistry.java:63)	at lobby.actors.SessionRegistry.doRun(SessionRegistry.java:1)	at co.paralleluniverse.actors.Actor.run0(Actor.java:692)	at co.paralleluniverse.actors.ActorRunner.run(ActorRunner.java:51)	at co.paralleluniverse.fibers.Fiber.run(Fiber.java:1019)