房间查询返回Maybe <List>在返回空结果时崩溃应用程序

我有房间查询：

@Query("SELECT * FROM classes WHERE _id IN(:values) ORDER BY date DESC")
fun getClassesByIds(values: List<Int>): Maybe<List<YClass>>

compositeDisposable.add(viewModel.getClassesById(classesTaken)
                    .subscribeOn(Schedulers.io())
                    .observeOn(AndroidSchedulers.mainThread())
                    .doOnSuccess { list ->
                        list.forEach {

                            setupInfo(student)
                        }
                    }
                    .doOnError { it.printStackTrace() }
                    .subscribe())

当结果为空时，当我从活动导航回来时，应用程序崩溃 . 实际上正在执行另一个查询时发生崩溃 . 第二个查询是错误的，即使它没有任何问题 .

引起：android.arch.persistence.room.EmptyResultSetException：查询返回空结果集：SELECT * FROM classes WHERE _id IN（）ORDER BY date DESC 03-06 00：07：53.476 31132-31199 /？ I / InputDispatcher：Window'Window {135734f u0 com.labfoodandfriends.nikitagudkovs.jlog / com.labfoodandfriends.nikitagudkovs.jlog.activity.student_and_teacher.StudentOverview}'花费4249.1ms处理最后一个输入事件：KeyEvent（deviceId = -1，source = 0x00000101，action = 1，flags = 0x00000048，keyCode = 4，scanCode = 0，metaState = 0x00000000，repeatCount = 0），policyFlags = 0x6b000002 03-06 00：07：53.612 13731-13736 / com.labfoodandfriends.nikitagudkovs.jlog I / zygote64：编译器分配6MB编译void android.view.ViewRootImpl.performTraversals（）03-06 00:07:53.661 13731-13736 / com.labfoodandfriends.nikitagudkovs.jlog I / zygote64：执行完整代码缓存集合，代码= 502KB，data = 339KB 03-06 00:07:53.662 13731-13736 / com.labfoodandfriends.nikitagudkovs.jlog I / zygote64：代码缓存收集后，代码= 501KB，数据= 295KB 03-06 00：07：55.873 13731- 13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：io.reactivex.exceptions.OnErrorNotImplementedException：查询返回空结果集：SELECT * FROM WHERE _id IN（）ORDER BY date DESC 03-06 00:07:55.874 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io.reactivex.internal.functions.Functions $ OnErrorMissingConsumer . 接受（Functions.java:704)03-06 00:07:55.875 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io.reactivex.internal.functions.Functions $ OnErrorMissingConsumer.accept（Functions . java：701）03-06 00:07:55.875 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io.reactivex.internal.observers.ConsumerSingleObserver.onError（ConsumerSingleObserver.java:47）03- 06 00：07：55.876 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io.reactivex.internal.operators.single.SingleDoOnError $ DoOnError.onError（SingleDoOnError.java:63)03-06 00 ：07：55.876 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io.reactivex.internal.operators.single.SingleDoOnSuccess $ DoOnSuccess.onError（SingleDoOnSuccess.java:64)03-06 00:07 ：55.877 13731- 13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io.reactivex.internal.operators.single.SingleObserveOn $ ObserveOnSingleObserver.run（SingleObserveOn.java:79)03-06 00:07:55.877 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io.reactivex.android.schedulers.HandlerScheduler $ ScheduledRunnable.run（HandlerScheduler.java:109)03-06 00:07:55.878 13731-13731 / com.labfoodandfriends . nikitagudkovs.jlog W / System.err：在android.os.Handler.handleCallback（Handler.java:790)03-06 00:07:55.878 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at android.os.Handler.dispatchMessage（Handler.java:99)03-06 00:07:55.878 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at android.os.Looper.loop（Looper . java：164）03-06 00：07：55.879 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at android.app.ActivityThread.main（ActivityThread.java:6494)03-06 00:07 ：55.879 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.er r：at java.lang.reflect.Method.invoke（Native Method）03-06 00：07：55.879 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at com.android.internal.os . RuntimeInit $ MethodAndArgsCaller.run（RuntimeInit.java:438)03-06 00:07:55.880 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at com.android.internal.os.ZygoteInit.main（ ZygoteInit.java:807)03-06 00:07:55.881 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：引起：android.arch.persistence.room.EmptyResultSetException：查询返回空结果集： SELECT * FROM classes WHERE _id IN（）ORDER BY date DESC 03-06 00:07:55.881 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at com.labfoodandfriends.nikitagudkovs.jlog.database.dao .StudentDAO_Impl $ 6.call（StudentDAO_Impl.java:345)03-06 00:07:55.882 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at com.labfoodandfriends.nikitagudkovs.jlog.database.dao . StudentDAO_Impl $ 6.call（StudentDAO_Impl.java:327)0 3-06 00:07:55.882 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io.reactivex.internal.operators.single.SingleFromCallable.subscribeActual（SingleFromCallable.java:44）03-06 00 ：07：55.883 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io.reactivex.Single.subscribe（Single.java:3096）03-06 00：07：55.883 13731-13731 / com . labfoodandfriends.nikitagudkovs.jlog W / System.err：atio.reactivex.internal.operators.single.SingleSubscribeOn $ SubscribeOnObserver.run（SingleSubscribeOn.java:89)03-06 00:07:55.884 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io . reactivex.Scheduler $ DisposeTask.run（Scheduler.java:463)03-06 00:07:55.884 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io.reactivex.internal.schedulers.ScheduledRunnable . run（ScheduledRunnable.java:66）03-06 00:07:55.885 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at io.reactivex.internal.schedulers.ScheduledRunnable.call（ScheduledRunnable.java： 57）03-06 00:07:55.885 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at java.util.concurrent.FutureTask.run（FutureTask.java:266)03-06 00:07 ：55.885 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at java.util.concurrent.ScheduledThreadPoolExecutor $ ScheduledFutureTask.run（ScheduledThreadPoolExecutor.java:301）03-06 00：07：55.886 13731-13731 / com.labfoodandfriends.ni kitagudkovs.jlog W / System.err：at java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1162)03-06 00:07:55.886 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err ：at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:636)03-06 00:07:55.887 13731-13731 / com.labfoodandfriends.nikitagudkovs.jlog W / System.err：at java.lang . Thread.run（Thread.java:764)03-06 00:07:55.903 13731-13736 / com.labfoodandfriends.nikitagudkovs.jlog I / zygote64：部分代码缓存集合，代码= 503KB，数据= 301KB 03-06 00 ：07：55.904 31132-15809 /？ W / ActivityManager：强制完成活动com.labfoodandfriends.nikitagudkovs.jlog / .activity.students.StudentsActivity 03-06 00:07:55.909 13731-13736 / com.labfoodandfriends.nikitagudkovs.jlog I / zygote64：代码缓存收集后，代码= 503KB，data = 301KB 03-06 00:07:55.909 13731-13736 / com.labfoodandfriends.nikitagudkovs.jlog I / zygote64：将代码缓存容量增加到2MB 03-06 00:07:55.920 31132-31147 /？ I / ActivityManager：显示包com.labfoodandfriends.nikitagudkovs.jlog的崩溃对话框u0 03-06 00：07：55.990 31132-1471 /？ I / OpenGLRenderer：初始化的EGL，版本1.4 03-06 00:07:55.990 31132-1471 /？ D / OpenGLRenderer：交换行为2 03-06 00：07：56.407 31132-31146 /？ W / ActivityManager：ActivityRecord的活动暂停超时{395d736 u0 com.labfoodandfriends.nikitagudkovs.jlog / .activity.students.StudentsActivity t7082 f}