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

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java.lang.NullPointerException:
at io.reactivex.observers.SerializedObserver.onNext(SerializedObserver.java:91)
at io.reactivex.internal.operators.observable.ObservableWithLatestFrom$WithLatestFromObserver.onNext(ObservableWithLatestFrom.java:101)
at io.reactivex.internal.operators.observable.ObservableFilter$FilterObserver.onNext(ObservableFilter.java:51)
at io.reactivex.internal.operators.observable.ObservableMap$MapObserver.onNext(ObservableMap.java:63)
at io.reactivex.subjects.PublishSubject$PublishDisposable.onNext(PublishSubject.java:263)
at io.reactivex.subjects.PublishSubject.onNext(PublishSubject.java:182)

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