#fixed code
                                @Override
    public Collection<FileAbstractModel> getFiles(String dir) {
        logger.debug("Listing local files from {}", dir);
        File[] files = new File(dir).listFiles();
        Collection<FileAbstractModel> result;

        if (files != null) {
            result = new ArrayList<>(files.length);

            // Iterate other files
            for (File file : files) {
                result.add(toFileAbstractModel(dir, file));
            }
        } else {
            logger.debug("Symlink on windows gives null for listFiles(). Skipping [{}]", dir);
            result = Collections.EMPTY_LIST;
        }


        logger.debug("{} local files found", result.size());
        return result;
    }
#vulnerable code 
                                @Override
    public Collection<FileAbstractModel> getFiles(String dir) {
        if (logger.isDebugEnabled()) logger.debug("Listing local files from {}", dir);
        File[] files = new File(dir).listFiles();

        Collection<FileAbstractModel> result = new ArrayList<>(files.length);

        // Iterate other files
        for (File file : files) {
            result.add(toFileAbstractModel(dir, file));
        }

        if (logger.isDebugEnabled()) logger.debug("{} local files found", result.size());
        return result;
    } 
                            #location 6 
                            #vulnerability type NULL_DEREFERENCE