RxJavaAsyncBug

java.lang.IllegalStateException: Exception thrown on Scheduler.Worker thread. Add `onError` handling.
            at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:52)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: rx.exceptions.OnErrorNotImplementedException: Sequence contains no elements
            at rx.Observable$31.onError(Observable.java:7134)
            at rx.observers.SafeSubscriber._onError(SafeSubscriber.java:154)
            at rx.observers.SafeSubscriber.onError(SafeSubscriber.java:111)
            at rx.internal.operators.NotificationLite.accept(NotificationLite.java:147)
            at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.pollQueue(OperatorObserveOn.java:177)
            at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.access$000(OperatorObserveOn.java:65)
            at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber$2.call(OperatorObserveOn.java:153)
            at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:47)
            at android.os.Handler.handleCallback(Handler.java:739)
            at android.os.Handler.dispatchMessage(Handler.java:95)
            at android.os.Looper.loop(Looper.java:135)
            at android.app.ActivityThread.main(ActivityThread.java:5221)
            at java.lang.reflect.Method.invoke(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:372)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:899)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:694)
     Caused by: java.util.NoSuchElementException: Sequence contains no elements
            at rx.internal.operators.OperatorSingle$1.onCompleted(OperatorSingle.java:82)
            at rx.internal.operators.OperatorFilter$1.onCompleted(OperatorFilter.java:42)
            at rx.internal.operators.OperatorOnErrorReturn$1.onError(OperatorOnErrorReturn.java:84)
            at rx.internal.operators.OperatorMap$1.onError(OperatorMap.java:49)
            at rx.internal.operators.OperatorMap$1.onError(OperatorMap.java:49)
            at rx.internal.operators.OperatorMap$1.onError(OperatorMap.java:49)
            at rx.internal.operators.OperatorMap$1.onNext(OperatorMap.java:58)
            at rx.subjects.SubjectSubscriptionManager$SubjectObserver.onNext(SubjectSubscriptionManager.java:224)
            at rx.subjects.AsyncSubject.onCompleted(AsyncSubject.java:101)
            at rx.util.async.Async$1$1.call(Async.java:533)
            at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:47)
            at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:422)
            at java.util.concurrent.FutureTask.run(FutureTask.java:237)
            at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:152)
            at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:265)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:818)