FrameProcessing Thread is null on release

[sharmad1205]

Calling BarcodeCaptureActivity as startActivityForResult causing... NPE

Unable to destroy activity {....activities.BarcodeCapture.BarcodeCaptureActivity}: java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.Thread$State java.lang.Thread.getState()' on a null object reference.
on CameraSource.java --->FrameProcessingRunnable
@SuppressLint("Assert")
void release() {
assert (mProcessingThread.getState() == State.TERMINATED);
mDetector.release();
mDetector = null;
}
mProcessingThread is null

[cleanarchitector]

https://stackoverflow.com/questions/64893524/android-gradle-plugin-update-4-1-0-causing-barcode-scanner-to-crash