Unable to add window -- token null is not valid; is your activity running?

[ArcherEmiya05]

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Step 1: Are you in the right place?

Yes

Step 2: Describe your environment

• Android device: Nexus 5X
• Android OS version: 6.0.1
• Google Play Services version: 4.3.13
• Firebase/Play Services SDK version: 21.0.6
• FirebaseUI version: 8.0.1

Step 3: Describe the problem:

Running the app that uses Firebase UI (Phone Auth) with Firebase Test Lab, there is an intermittent issue with country list. I never encounter this issue personally thus I am not sure how to exactly reproduce it and I don't see any issue on the Test matrix video.

Steps to reproduce:

N/A

Observed Results:

CountryListSpinner.java line 109
com.firebase.ui.auth.ui.phone.CountryListSpinner.onFocus 

 
Fatal Exception: java.lang.RuntimeException: Unable to start activity ComponentInfo{com.sample.app/com.firebase.ui.auth.ui.phone.PhoneActivity}: android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2416)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
       at android.app.ActivityThread.-wrap11(ActivityThread.java)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5421)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Caused by android.view.WindowManager$BadTokenException: Unable to add window -- token null is not valid; is your activity running?
       at android.view.ViewRootImpl.setView(ViewRootImpl.java:567)
       at android.view.WindowManagerGlobal.addView(WindowManagerGlobal.java:310)
       at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:85)
       at android.widget.PopupWindow.invokePopup(PopupWindow.java:1258)
       at android.widget.PopupWindow.showAsDropDown(PopupWindow.java:1110)
       at androidx.appcompat.widget.AppCompatPopupWindow.showAsDropDown(AppCompatPopupWindow.java:77)
       at androidx.core.widget.PopupWindowCompat$Api19Impl.showAsDropDown(PopupWindowCompat.java:247)
       at androidx.core.widget.PopupWindowCompat.showAsDropDown(PopupWindowCompat.java:71)
       at androidx.appcompat.widget.ListPopupWindow.show(ListPopupWindow.java:757)
       at com.firebase.ui.auth.ui.phone.CountryListSpinner.onFocus(CountryListSpinner.java:109)
       at com.firebase.ui.auth.ui.phone.CountryListSpinner.onFocusChanged(CountryListSpinner.java:101)
       at android.view.View.handleFocusGainInternal(View.java:5478)
       at android.view.View.requestFocusNoSearch(View.java:8476)
       at android.view.View.requestFocus(View.java:8455)
       at android.view.View.requestFocus(View.java:8422)
       at android.view.View.requestFocus(View.java:8401)
       at com.android.internal.policy.PhoneWindow.restoreHierarchyState(PhoneWindow.java:2043)
       at android.app.Activity.onRestoreInstanceState(Activity.java:1008)
       at android.app.Activity.performRestoreInstanceState(Activity.java:963)
       at android.app.Instrumentation.callActivityOnRestoreInstanceState(Instrumentation.java:1163)
       at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2389)
       at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2476)
       at android.app.ActivityThread.-wrap11(ActivityThread.java)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1344)
       at android.os.Handler.dispatchMessage(Handler.java:102)
       at android.os.Looper.loop(Looper.java:148)
       at android.app.ActivityThread.main(ActivityThread.java:5421)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)

Expected Results:

No error