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rx.exceptions.OnErrorNotImplementedException: Attempt to invoke interface method 'int java.util.List.size()' on a null object reference	at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:386)	at rx.internal.util.InternalObservableUtils$ErrorNotImplementedAction.call(InternalObservableUtils.java:383)	at rx.internal.util.ActionSubscriber.onError(ActionSubscriber.java:44)	at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:157)	at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:120)	at rx.exceptions.Exceptions.throwOrReport(Exceptions.java:204)	at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:144)	at rx.internal.operators.OperatorFilter$FilterSubscriber.onNext(OperatorFilter.java:73)	at rx.internal.operators.OnSubscribeCombineLatest$LatestCoordinator.drain(OnSubscribeCombineLatest.java:286)	at rx.internal.operators.OnSubscribeCombineLatest$LatestCoordinator.combine(OnSubscribeCombineLatest.java:228)	at rx.internal.operators.OnSubscribeCombineLatest$CombinerSubscriber.onNext(OnSubscribeCombineLatest.java:383)	at rx.observers.SafeSubscriber.onNext(SafeSubscriber.java:139)	at rx.internal.operators.OperatorFilter$FilterSubscriber.onNext(OperatorFilter.java:73)	at rx.internal.operators.OperatorMaterialize$ParentSubscriber.onNext(OperatorMaterialize.java:113)	at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.call(OperatorObserveOn.java:227)	at rx.android.schedulers.LooperScheduler$ScheduledAction.run(LooperScheduler.java:107)