#fixed code
                                public List<PojoPackage> getPojoSubPackages() {
        List<PojoPackage> pojoPackageSubPackages = new LinkedList<PojoPackage>();

        List<File> paths = PackageHelper.getPackageDirectories(packageName);
        for (File path : paths) {
            for (File entry : path.listFiles()) {
                if (entry.isDirectory()) {
                    String subPackageName = packageName + PACKAGE_DELIMETER + entry.getName();
                    pojoPackageSubPackages.add(new PojoPackageImpl(subPackageName));
                }
            }
        }

        return pojoPackageSubPackages;
    }
#vulnerable code 
                                public List<PojoPackage> getPojoSubPackages() {
        List<PojoPackage> pojoPackageSubPackages = new LinkedList<PojoPackage>();

        File directory = PackageHelper.getPackageAsDirectory(packageName);
        for (File entry : directory.listFiles()) {
            if (entry.isDirectory()) {
                String subPackageName = packageName + PACKAGE_DELIMETER + entry.getName();
                pojoPackageSubPackages.add(new PojoPackageImpl(subPackageName));
            }
        }

        return pojoPackageSubPackages;
    } 
                            #location 5 
                            #vulnerability type NULL_DEREFERENCE