java.lang.NullPointerException: This exception has no message.

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at io.reactivex.observers.SerializedObserver.onNext(
at io.reactivex.internal.operators.observable.ObservableWithLatestFrom$WithLatestFromObserver.onNext(
at io.reactivex.internal.operators.observable.ObservableFilter$FilterObserver.onNext(
at io.reactivex.internal.operators.observable.ObservableMap$MapObserver.onNext(
at io.reactivex.subjects.PublishSubject$PublishDisposable.onNext(
at io.reactivex.subjects.PublishSubject.onNext(

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