#vulnerable code 
                                @Override
    protected final void doGet(final SlingHttpServletRequest request, final SlingHttpServletResponse response) throws
            ServletException, IOException {

        final String transformName = PathInfoUtil.getSuffixSegment(request, 0);
        final NamedImageTransformer namedImageTransformer = this.namedImageTransformers.get(transformName);

        final Image image = this.resolveImage(request);
        final Layer layer = this.getLayer(image);
        final String mimeType = this.getMimeType(request, image);

        // Transform the image
        namedImageTransformer.transform(layer);

        final double quality = (mimeType.equals(MIME_TYPE_GIF) ? IMAGE_GIF_MAX_QUALITY : IMAGE_MAX_QUALITY);
        response.setContentType(mimeType);

        layer.write(mimeType, quality, response.getOutputStream());

        response.flushBuffer();
    } 
                            #location 18 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    protected final void doGet(final SlingHttpServletRequest request, final SlingHttpServletResponse response) throws
            ServletException, IOException {

        final String transformName = PathInfoUtil.getSuffixSegment(request, 0);
        final NamedImageTransformer namedImageTransformer = this.namedImageTransformers.get(transformName);

        final Image image = this.resolveImage(request);
        final String mimeType = this.getMimeType(request, image);
        Layer layer = this.getLayer(image);
        
        // Transform the image
        layer = namedImageTransformer.transform(layer);

        final double quality = (mimeType.equals(MIME_TYPE_GIF) ? IMAGE_GIF_MAX_QUALITY : IMAGE_MAX_QUALITY);
        response.setContentType(mimeType);

        layer.write(mimeType, quality, response.getOutputStream());

        response.flushBuffer();
    }