code: protected void releaseHelper(H helper) {
  		OpenHelperManager.releaseHelper();
  		logger.trace("{}: helper {} was released, set to null", this, helper);
  		this.helper = null;
  	}
docs: Release the helper instance created in {@link #getHelperInternal(Context)}. You most likely will not need to call
  this directly since {@link #onDestroy()} does it for you.
  
  <p>
  <b> NOTE: </b> If you override this method, you most likely will need to override the
  {@link #getHelperInternal(Context)} method as well.
  </p>