Crash in BlinkIdDialogOnboardingView upon config change

[geranzo]

Description

We are seeing from time to time the following crash in the field:

          Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.view.View.hasFocus()' on a null object reference
       at com.microblink.blinkid.fragment.overlay.blinkid.reticleui.BlinkIdDialogOnboardingView$1.onPageSelected(line:18)
       at androidx.viewpager.widget.ViewPager.dispatchOnPageSelected(ViewPager.java:1947)
       at androidx.viewpager.widget.ViewPager.setCurrentItemInternal(ViewPager.java:665)
       at androidx.viewpager.widget.ViewPager.setCurrentItemInternal(ViewPager.java:631)
       at androidx.viewpager.widget.ViewPager.setCurrentItem(ViewPager.java:612)
       at com.microblink.blinkid.fragment.overlay.blinkid.reticleui.BlinkIdDialogOnboardingView.onConfigurationChanged(BlinkIdDialogOnboardingView.java:19)
       at com.microblink.blinkid.fragment.overlay.blinkid.reticleui.ReticleOverlayView.onConfigurationChanged(line:4)
       at com.microblink.blinkid.fragment.overlay.blinkid.BlinkIdOverlayController.IllIIIllII(BlinkIdOverlayController.java:5)
       at com.microblink.blinkid.fragment.overlay.BaseOverlayController$2.onConfigurationChanged(BaseOverlayController.java:1)
       at com.microblink.blinkid.fragment.RecognizerRunnerFragment.onConfigurationChanged(line:6)
       at androidx.fragment.app.Fragment.performConfigurationChanged(Fragment.java)
       at androidx.fragment.app.FragmentManager.dispatchConfigurationChanged(FragmentManager.java:3090)
       at androidx.fragment.app.FragmentManager.lambda$new$0(FragmentManager.java:469)
       at androidx.activity.ComponentActivity.onConfigurationChanged(ComponentActivity.kt:849)
       at androidx.appcompat.app.AppCompatActivity.onConfigurationChanged(AppCompatActivity.java)
       at android.app.ActivityThread.performActivityConfigurationChanged(ActivityThread.java:5554)
       at android.app.ActivityThread.performConfigurationChangedForActivity(ActivityThread.java:5421)
       at android.app.ActivityThread.performConfigurationChangedForActivity(ActivityThread.java:5399)
       at android.app.ActivityThread.handleActivityConfigurationChanged(ActivityThread.java:5819)
       at android.app.servertransaction.ActivityConfigurationChangeItem.execute(ActivityConfigurationChangeItem.java:48)
       at android.app.servertransaction.TransactionExecutor.executeCallbacks(TransactionExecutor.java:135)
       at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:95)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2045)
       at android.os.Handler.dispatchMessage(Handler.java:107)
       at android.os.Looper.loop(Looper.java:214)
       at android.app.ActivityThread.main(ActivityThread.java:7425)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:492)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:935)

I've tried to reproduce it and it wasn't hard to do so. I opened the BlinkId activity (started a scan), then hit the ? (Help) button to show the onboarding dialog, then I changed the theme mode light <--> dark and at this point the MicroBlink SDK crashes. The stack trace from my local reproduction is slightly different than what we see on the Crashlytics above but it ends up in the exact same line of code in BlinkIdDialogOnboardingView:

          Fatal Exception: java.lang.NullPointerException: Attempt to invoke virtual method 'boolean android.view.View.hasFocus()' on a null object reference
       at com.microblink.blinkid.fragment.overlay.blinkid.reticleui.BlinkIdDialogOnboardingView$1.onPageSelected(line:18)
       at androidx.viewpager.widget.ViewPager.dispatchOnPageSelected(ViewPager.java:1947)
       at androidx.viewpager.widget.ViewPager.setCurrentItemInternal(ViewPager.java:665)
       at androidx.viewpager.widget.ViewPager.setCurrentItemInternal(ViewPager.java:631)
       at androidx.viewpager.widget.ViewPager.onRestoreInstanceState(ViewPager.java:1462)
       at android.view.View.dispatchRestoreInstanceState(View.java:22522)
       at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:4098)
       at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:4104)
       at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:4104)
       at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:4104)
       at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:4104)
       at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:4104)
       at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:4104)
       at android.view.ViewGroup.dispatchRestoreInstanceState(ViewGroup.java:4104)
       at android.view.View.restoreHierarchyState(View.java:22500)
       at androidx.fragment.app.Fragment.restoreViewState(Fragment.java:698)
       at androidx.fragment.app.Fragment.restoreViewState(Fragment.java:3176)
       at androidx.fragment.app.Fragment.performActivityCreated(Fragment.java:3161)
       at androidx.fragment.app.FragmentStateManager.activityCreated(FragmentStateManager.java:619)
       at androidx.fragment.app.FragmentStateManager.moveToExpectedState(FragmentStateManager.java:275)
       at androidx.fragment.app.FragmentStore.moveToExpectedState(FragmentStore.java:114)
       at androidx.fragment.app.FragmentManager.moveToState(FragmentManager.java:1455)
       at androidx.fragment.app.FragmentManager.dispatchStateChange(FragmentManager.java:3034)
       at androidx.fragment.app.FragmentManager.dispatchActivityCreated(FragmentManager.java:2952)
       at androidx.fragment.app.FragmentController.dispatchActivityCreated(FragmentController.java:263)
       at androidx.fragment.app.FragmentActivity.onStart(FragmentActivity.java:350)
       at androidx.appcompat.app.AppCompatActivity.onStart(AppCompatActivity.java:251)
       at android.app.Instrumentation.callActivityOnStart(Instrumentation.java:1601)
       at android.app.Activity.performStart(Activity.java:8790)
       at android.app.ActivityThread.handleStartActivity(ActivityThread.java:4056)
       at android.app.servertransaction.TransactionExecutor.performLifecycleSequence(TransactionExecutor.java:230)
       at android.app.servertransaction.TransactionExecutor.cycleToPath(TransactionExecutor.java:210)
       at android.app.servertransaction.TransactionExecutor.executeLifecycleState(TransactionExecutor.java:182)
       at android.app.servertransaction.TransactionExecutor.execute(TransactionExecutor.java:103)
       at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2643)
       at android.os.Handler.dispatchMessage(Handler.java:106)
       at android.os.Looper.loopOnce(Looper.java:257)
       at android.os.Looper.loop(Looper.java:368)
       at android.app.ActivityThread.main(ActivityThread.java:8839)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:572)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1049)

Environment Details

BlinkID version: 6.11.2

Device model: any

Device Android version: any

Device ABI (processor architecture, e.g. ARMv7): ARM*