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java.lang.NullPointerException: null	at java.util.Collections$UnmodifiableCollection.(Collections.java:1026)	at java.util.Collections$UnmodifiableSet.(Collections.java:1128)	at java.util.Collections.unmodifiableSet(Collections.java:1118)	at pl.allegro.tech.hermes.consumers.supervisor.workload.SubscriptionAssignmentView.getAssignmentsForConsumerNode(SubscriptionAssignmentView.java:75)	at pl.allegro.tech.hermes.consumers.supervisor.workload.SubscriptionAssignmentView.getSubscriptionsForConsumerNode(SubscriptionAssignmentView.java:71)	at pl.allegro.tech.hermes.consumers.supervisor.workload.mirror.MirroringSupervisorController.assignedSubscriptions(MirroringSupervisorController.java:127)	at pl.allegro.tech.hermes.consumers.supervisor.monitor.ConsumersRuntimeMonitor.checkCorrectness(ConsumersRuntimeMonitor.java:46)	at pl.allegro.tech.hermes.consumers.supervisor.monitor.ConsumersRuntimeMonitor.run(ConsumersRuntimeMonitor.java:74)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)	at java.lang.Thread.run(Thread.java:745)