NullPointerException upon opening GalleryActivity

[kckunal2612]

I am opening the GalleryActivity by the following statements (Kotlin) -

        val intent = Intent(context, GalleryActivity::class.java)
        val params = Params()
        // set Picker Limit to ONE to enable only SINGLE IMAGE click
        params.pickerLimit = 1
        params.toolbarColor = resources.getColor(R.color.colorPrimary)
        params.actionButtonColor = resources.getColor(R.color.colorPrimary)
        intent.putExtra(Constants.KEY_PARAMS, params)
        startActivityForResult(intent, Constants.TYPE_MULTI_PICKER)

Upon opening the GalleryActivity, I get a "NullPointerException" at the bottom (in a Snackbar), and the following message in the exception stacktrace -
System.err: at com.vlk.multimager.activities.GalleryActivity$ApiSimulator.doInBackground(GalleryActivity.java:339)

GalleryActivity -

protected ArrayList<Image> doInBackground(@NonNull Void... voids) {
         ArrayList images = new ArrayList();
         Cursor imageCursor = null;

         try {
             String[] e = new String[]{"_id", "_data", "date_added", "height", "width"};
             String orderBy = "date_added DESC";
             imageCursor = GalleryActivity.this.getContentResolver().query(Media.EXTERNAL_CONTENT_URI, e, (String)null, (String[])null, "date_added DESC");

             ---> while(imageCursor.moveToNext()) {
                 long _id = imageCursor.getLong(imageCursor.getColumnIndex("_id"));
      

Here is the screenshot of the error -

This is only happening on devices with API Level 16 (ICS), but not on devices with API levels >= 19 (kitkat).
Thanks.