#vulnerable code 
                                @Override
    public int getHeight() throws IOException {
        if (compression == 1) { // 1 = no compression
            Entry height = ifd.getEntryById(TIFF.TAG_IMAGE_HEIGHT);

            if (height == null) {
                throw new IIOException("Missing dimensions for RAW EXIF thumbnail");
            }

            return ((Number) height.getValue()).intValue();
        }
        else if (compression == 6) { // 6 = JPEG compression
            return readJPEGCached(false).getHeight();
        }
        else {
            throw new IIOException("Unsupported EXIF thumbnail compression: " + compression);
        }
    } 
                            #location 13 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public int getHeight() throws IOException {
        if (compression == 1) { // 1 = no compression
            Entry height = ifd.getEntryById(TIFF.TAG_IMAGE_HEIGHT);

            if (height == null) {
                throw new IIOException("Missing dimensions for unknown EXIF thumbnail");
            }

            return ((Number) height.getValue()).intValue();
        }
        else if (compression == 6) { // 6 = JPEG compression
            return readJPEGCached(false).getHeight();
        }
        else {
            throw new IIOException("Unsupported EXIF thumbnail compression  (expected 1 or 6): " + compression);
        }
    }