java.lang.NullPointerException:
  at io.flutter.view.FlutterView.getAccessibilityNodeProvider (Unknown Source:2)
  at android.view.View.createAccessibilityNodeInfoInternal (View.java:7315)
  at android.view.View.createAccessibilityNodeInfo (View.java:7305)
  at android.view.accessibility.AccessibilityRecord.setSource (AccessibilityRecord.java:146)
  at android.view.accessibility.AccessibilityRecord.setSource (AccessibilityRecord.java:119)
  at android.view.View.onInitializeAccessibilityEventInternal (View.java:7257)
  at android.view.View.onInitializeAccessibilityEvent (View.java:7245)
  at android.view.View.sendAccessibilityEventUncheckedInternal (View.java:7107)
  at android.view.View.sendAccessibilityEventUnchecked (View.java:7092)
  at android.view.View.sendAccessibilityEventInternal (View.java:7069)
  at android.view.View.sendAccessibilityEvent (View.java:7036)
  at android.view.View.onFocusChanged (View.java:6950)
  at android.view.View.handleFocusGainInternal (View.java:6647)
  at android.view.View.requestFocusNoSearch (View.java:10877)
  at android.view.View.requestFocus (View.java:10856)
  at android.view.ViewGroup.onRequestFocusInDescendants (ViewGroup.java:3208)
  at android.view.ViewGroup.requestFocus (ViewGroup.java:3164)
  at android.view.ViewGroup.onRequestFocusInDescendants (ViewGroup.java:3208)
  at android.view.ViewGroup.requestFocus (ViewGroup.java:3164)
  at android.view.ViewGroup.onRequestFocusInDescendants (ViewGroup.java:3208)
  at android.view.ViewGroup.requestFocus (ViewGroup.java:3167)
  at android.view.View.requestFocus (View.java:10823)
  at android.view.View.requestFocus (View.java:10765)
  at android.view.ViewRootImpl.focusableViewAvailable (ViewRootImpl.java:3477)
  at android.view.View.setFlags (View.java:13376)
  at android.view.View.setVisibility (View.java:9432)
  at android.app.Activity.makeVisible (Activity.java:5440)
  at android.app.ActivityThread.handleResumeActivity (ActivityThread.java:3951)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3052)
  at android.app.ActivityThread.-wrap11 (Unknown Source)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1688)
  at android.os.Handler.dispatchMessage (Handler.java:105)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6798)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:240)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:767)