com.hazelcast.spi.exception.TargetDisconnectedException: java.lang.NullPointerException

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com.hazelcast.spi.exception.TargetDisconnectedException: java.lang.NullPointerException
at com.hazelcast.client.spi.impl.ClientInvocationServiceSupport$CleanResourcesTask.notifyException(ClientInvocationServiceSupport.java:240)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:304)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:178)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:745)
at com.hazelcast.util.executor.HazelcastManagedThread.executeRun(HazelcastManagedThread.java:76)
at com.hazelcast.util.executor.HazelcastManagedThread.run(HazelcastManagedThread.java:92)

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