Google Play console reports app crash, I can not reproduce

Google Play Console in Android Vitals reports provides me with this information

java.lang.RuntimeException: 
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2955)
  at android.app.ActivityThread.handleLaunchActivity (ActivityThread.java:3030)
  at android.app.ActivityThread.-wrap11 (Unknown Source)
  at android.app.ActivityThread$H.handleMessage (ActivityThread.java:1696)
  at android.os.Handler.dispatchMessage (Handler.java:105)
  at android.os.Looper.loop (Looper.java:164)
  at android.app.ActivityThread.main (ActivityThread.java:6938)
  at java.lang.reflect.Method.invoke (Native Method)
  at com.android.internal.os.Zygote$MethodAndArgsCaller.run (Zygote.java:327)
  at com.android.internal.os.ZygoteInit.main (ZygoteInit.java:1374)
Caused by: java.lang.NullPointerException: 
  at com.golendukhin.whitenoise.GridAdapter.getCount (GridAdapter.java:52)
  at android.widget.GridView.setAdapter (GridView.java:243)
  at com.golendukhin.whitenoise.FoldersGridActivity.onCreate (FoldersGridActivity.java:60)
  at android.app.Activity.performCreate (Activity.java:7183)
  at android.app.Instrumentation.callActivityOnCreate (Instrumentation.java:1220)
  at android.app.ActivityThread.performLaunchActivity (ActivityThread.java:2908)

As I have understood this happens because getCount method of grid adapter returns null value. Hense, grid adapter does not work. Hense, whole acrivity is not created. Only Samsung devices has such a problem.

First, I've tryed to create same emulated device with same Android version, RAM and ARM. Emulator works absolutely great. No mistakes.

Then I have added some tests to be sure getCount works and activity is created.

@RunWith(AndroidJUnit4.class)
public class GridViewTest {

    @Rule
    public ActivityTestRule<FoldersGridActivity> foldersGridActivityTestRule  = new  ActivityTestRule<>(FoldersGridActivity.class);

    @Test
    public void ensureGridAdapterIsNotNull() {
        FoldersGridActivity foldersGridActivity = foldersGridActivityTestRule.getActivity();
        View view = foldersGridActivity.findViewById(R.id.grid_view);
        GridView gridView = (GridView) view;
        GridAdapter gridAdapter = (GridAdapter) gridView.getAdapter();
        assertThat(gridAdapter, notNullValue());
    }

    @Test
    public void ensureArrayAdapterInGridActivityIsNotEmpty() {
        FoldersGridActivity foldersGridActivity = foldersGridActivityTestRule.getActivity();
        View view = foldersGridActivity.findViewById(R.id.grid_view);
        GridView gridView = (GridView) view;
        GridAdapter gridAdapter = (GridAdapter) gridView.getAdapter();
        assertTrue(gridAdapter.getCount() > 0 );
    }

    @Test
    public void gridViewIsVisibleAndClickable() {
        onData(anything()).inAdapterView(withId(R.id.grid_view)).atPosition(0).perform(click());
        onView(withId(R.id.toolbar_title_text_view)).check(matches(withText("rain")));
    }
}

And again all emulated devices successfully pass tests. Then I have added FireBase TestLab and launched my tests on Galaxy S9 real device with Android 8. All tests are passed.

Code of adapter. Yes, I have overriten getCount() method even though it does not make sence.

public class GridAdapter extends ArrayAdapter<TracksFolder> {
    @BindView(R.id.folder_text_view) TextView textView;
    @BindView(R.id.grid_item_image_view) ImageView imageView;

    private ArrayList<TracksFolder> tracksFolders;
    private Context context;

    GridAdapter(Context context, int resource, ArrayList<TracksFolder> tracksFolders) {
        super(context, resource, tracksFolders);
        this.tracksFolders = tracksFolders;
        this.context = context;
    }

    /**
     * @return grid item, customized via TracksFolder class instance
     */
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        if (convertView == null) {
            convertView = LayoutInflater.from(context).inflate(R.layout.grid_item, parent, false);
        }
        ButterKnife.bind(this, convertView);

        String folderName = tracksFolders.get(position).getFolderName();
        int imageResource = tracksFolders.get(position).getImageResource();
        textView.setText(folderName);
        imageView.setImageResource(imageResource);

        return convertView;
    }

    /**
     * Added to possibly avoid NPE on multiple devices
     * Could not reproduce this error
     * @return size of tracksFolders
     */
    @Override
    public int getCount() {
        return tracksFolders.size();
    }
}

So, I have got a couple of question: First, does this crash reports mean that this crash happens every time Sumsung owner launches app? Since some Samsung devices persist in statistic, I assume no. Second, what am I supposed to do to somehow reproduce this mistake and eventually fix the bug.

I understand question is too broad, but I will really appreciate any help, because I absolutely don't know what to do next.