#vulnerable code 
                             @Override
	protected void executeInternal(ServiceHub serviceHub) throws DockerAccessException, MojoExecutionException {
		if (file == null) {
            throw new MojoExecutionException("'file' is required.");
        }
        if (name == null && alias == null) {
            throw new MojoExecutionException("'name' or 'alias' is required.");
        }
		// specify image by name or alias
		if (name != null && alias != null) {
			throw new MojoExecutionException("Cannot specify both name and alias.");
		}
		List<ImageConfiguration> images = getResolvedImages();
		
		ImageConfiguration image = null;
		for (ImageConfiguration ic : images) {
			if (name != null && name.equals(ic.getName())) {
				image = ic;
				break;
			}
			if (alias != null && alias.equals(ic.getAlias())) {
				image = ic;
				break;
			}
		}
		
		if (serviceHub.getQueryService().getImageId(image.getName()) == null) {
			throw new MojoExecutionException("No image found for " + image.getName());
		}
		
		serviceHub.getDockerAccess().saveImage(image.getName(), file, detectCompression(file));
		
		if (attach) {
			File fileObj = new File(file);
			if (fileObj.exists()) {
				String type = FilenameUtils.getExtension(file);
				if (classifier != null) {
					projectHelper.attachArtifact(project, type, classifier, fileObj);
				} else {
					projectHelper.attachArtifact(project, type, fileObj);
				}
			}
		}
		
	} 
                            #location 27 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                             @Override
	protected void executeInternal(ServiceHub serviceHub) throws DockerAccessException, MojoExecutionException {
		if (skip) {
			return;
		}

		String imageName = getImageName();
		String fileName = getFileName(imageName);
		log.info("Saving image %s to %s", imageName, fileName);
		if (!serviceHub.getQueryService().hasImage(imageName)) {
			throw new MojoExecutionException("No image " + imageName + " exists");
		}

		serviceHub.getDockerAccess().saveImage(imageName, fileName, ArchiveCompression.fromFileName(fileName));

		if (attach) {
			attachSaveArchive();
		}

	}