Fatal Exception: java.lang.NullPointerException about blurry

[Ariel4Android]

The same issue happened on some 3rd customized Android OS within my depolyed app.
I tried to modify code BlurTask.java, frome line 60 like this

` Context context = contextWeakRef.get();
if (context != null) {

      final BitmapDrawable bitmapDrawable =
              new BitmapDrawable(res, Blur.of(context, capture, factor));

      if (callback != null) {
        new Handler(Looper.getMainLooper()).post(new Runnable() {
          @Override public void run() {
            callback.done(bitmapDrawable);
          }
        });
      }
    }`