The upstream 1.x Observable signalled a null value which is not supported in 2.x

[shakil807g]

  Observable<Long> intervalObservable = Observable.interval(10, TimeUnit.SECONDS);
    RxJavaInterop.toV2Observable(RxView.clicks(fab))
            .switchMap(aVoid ->
                    intervalObservable
                            .observeOn(AndroidSchedulers.mainThread())
                                .doOnNext(aLong -> {
                                    Log.d(TAG, "click: "+aLong);
                                })).subscribe();

i have a steam like this and it throwing exception

java.lang.NullPointerException: The upstream 1.x Observable signalled a null value which is not supported in 2.x at hu.akarnokd.rxjava.interop.ObservableV1ToObservableV2$ObservableSubscriber.onNext(ObservableV1ToObservableV2.java:58)at com.jakewharton.rxbinding.view.ViewClickOnSubscribe$1.onClick(ViewClickOnSubscribe.java:23) at android.view.View.performClick(View.java:5198) at android.view.View$PerformClick.run(View.java:21147) at android.os.Handler.handleCallback(Handler.java:739) at android.os.Handler.dispatchMessage(Handler.java:95) at android.os.Looper.loop(Looper.java:148) at android.app.ActivityThread.main(ActivityThread.java:5417) at java.lang.reflect.Method.invoke(Native Method) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

[JakeWharton]

This isn't a problem with the library. Map to a non-null value before converting or use the 2.0.0-SNAPSHOT.