#vulnerable code 
                                private void createTemplateParameters(File outputDir, Template template, File templatesDir) throws MojoExecutionException {
        JsonNodeFactory nodeFactory = JsonNodeFactory.instance;
        ObjectNode values = nodeFactory.objectNode();
        List<io.fabric8.openshift.api.model.Parameter> parameters = template.getParameters();
        if (parameters == null && parameters.isEmpty()) {
            return;
        }
        List<HelmParameter> helmParameters = new ArrayList<>();
        for (io.fabric8.openshift.api.model.Parameter parameter : parameters) {
            HelmParameter helmParameter = new HelmParameter(parameter);
            helmParameter.addToValue(values);
            helmParameters.add(helmParameter);
        }
        File outputChartFile = new File(outputDir, "values.yaml");
        try {
            saveYaml(values, outputChartFile);
        } catch (IOException e) {
            throw new MojoExecutionException("Failed to save chart values " + outputChartFile + ": " + e, e);
        }

        // now lets replace all the parameter expressions in each template
        File[] files = templatesDir.listFiles();
        if (files != null) {
            for (File file : files) {
                if (file.isFile()) {
                    String extension = Files.getExtension(file.getName()).toLowerCase();
                    if (extension.equals("yaml") || extension.equals("yml")) {
                        convertTemplateParameterExpressionsWithHelmExpressions(file, helmParameters);
                    }
                }
            }
        }
    } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                private void createTemplateParameters(File outputDir, Template template, File templatesDir) throws MojoExecutionException {
        JsonNodeFactory nodeFactory = JsonNodeFactory.instance;
        ObjectNode values = nodeFactory.objectNode();
        List<io.fabric8.openshift.api.model.Parameter> parameters = template.getParameters();
        if (parameters == null || parameters.isEmpty()) {
            return;
        }
        List<HelmParameter> helmParameters = new ArrayList<>();
        for (io.fabric8.openshift.api.model.Parameter parameter : parameters) {
            HelmParameter helmParameter = new HelmParameter(parameter);
            helmParameter.addToValue(values);
            helmParameters.add(helmParameter);
        }
        File outputChartFile = new File(outputDir, "values.yaml");
        try {
            saveYaml(values, outputChartFile);
        } catch (IOException e) {
            throw new MojoExecutionException("Failed to save chart values " + outputChartFile + ": " + e, e);
        }

        // now lets replace all the parameter expressions in each template
        File[] files = templatesDir.listFiles();
        if (files != null) {
            for (File file : files) {
                if (file.isFile()) {
                    String extension = Files.getExtension(file.getName()).toLowerCase();
                    if (extension.equals("yaml") || extension.equals("yml")) {
                        convertTemplateParameterExpressionsWithHelmExpressions(file, helmParameters);
                    }
                }
            }
        }
    }