mRootView = inflater.inflate(R.layout.fragment_subject, container, false);
assert mRootView != null;
mImageView = (ImageView) mRootView.findViewById(R.id.imageView);
if (mImageView == null) {
Log.error("mImageView is null.");
<BUG>} else {
mImageView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(final View v) {
doInvert();
}
});</BUG>
}

mRootView = inflater.inflate(R.layout.fragment_subject, container, false);
assert mRootView != null;
mImageView = (ImageView) mRootView.findViewById(R.id.imageView);
if (mImageView == null) {
Log.error("mImageView is null.");
} else {
mImageView.setOnClickListener(v -> doInvert());
}
