TypeCastException in ListItemRadioButtonWidget

[luoyexk]

Mobile-UXSDK-Beta-Android/android-uxsdk-beta-core/src/main/java/dji/ux/beta/core/base/panel/listitem/ListItemRadioButtonWidget.kt

Line 198 in 2a12cf3

val radioButton: RadioButton? = radioGroup.getChildAt(index) as RadioButton

Fatal Exception: kotlin.TypeCastException: null cannot be cast to non-null type android.widget.RadioButton
       at dji.ux.beta.core.base.widget.ListItemRadioButtonWidget.setSelected(ListItemRadioButtonWidget.kt:196)
       at dji.ux.beta.core.listitemwidget.rcstickmode.RCStickModeListItemWidget.updateUI(RCStickModeListItemWidget.kt:121)
       at dji.ux.beta.core.listitemwidget.rcstickmode.RCStickModeListItemWidget.access$updateUI(RCStickModeListItemWidget.kt:50)
       at dji.ux.beta.core.listitemwidget.rcstickmode.RCStickModeListItemWidget$reactToModelChanges$1.accept(RCStickModeListItemWidget.kt:81)
       at dji.ux.beta.core.listitemwidget.rcstickmode.RCStickModeListItemWidget$reactToModelChanges$1.accept(RCStickModeListItemWidget.kt:50)
       at dji.thirdparty.io.reactivex.internal.subscribers.LambdaSubscriber.onNext(:8)
       at dji.thirdparty.io.reactivex.internal.operators.flowable.FlowableObserveOn$ObserveOnSubscriber.runAsync(:68)
       at dji.thirdparty.io.reactivex.internal.operators.flowable.FlowableObserveOn$BaseObserveOnSubscriber.run(:17)
       at dji.thirdparty.io.reactivex.android.schedulers.HandlerScheduler$ScheduledRunnable.run(:2)
       at android.os.Handler.handleCallback(Handler.java:938)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:246)
       at android.app.ActivityThread.main(ActivityThread.java:8512)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:596)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)