#vulnerable code 
                                @Override
    public Bot findBot(String enterpriseId, String teamId) {
        AmazonS3 s3 = this.createS3Client();
        String fullKey = getBotKey(enterpriseId, teamId);
        if (isHistoricalDataEnabled()) {
            fullKey = fullKey + "-latest";
        }
        if (s3.getObjectMetadata(bucketName, fullKey) == null && enterpriseId != null) {
            String nonGridKey = getBotKey(null, teamId);
            if (isHistoricalDataEnabled()) {
                nonGridKey = nonGridKey + "-latest";
            }
            S3Object nonGridObject = s3.getObject(bucketName, nonGridKey);
            if (nonGridObject != null) {
                try {
                    Bot bot = toBot(nonGridObject);
                    bot.setEnterpriseId(enterpriseId); // the workspace seems to be in a Grid org now
                    save(s3, fullKey, JsonOps.toJsonString(bot), "AWS S3 putObject result of Bot data - {}");
                    return bot;
                } catch (Exception e) {
                    log.error("Failed to save a new Bot data for enterprise_id: {}, team_id: {}", enterpriseId, teamId);
                }
            }
        }
        S3Object s3Object = s3.getObject(bucketName, fullKey);
        try {
            return toBot(s3Object);
        } catch (IOException e) {
            log.error("Failed to load Bot data for enterprise_id: {}, team_id: {}", enterpriseId, teamId);
            return null;
        }
    } 
                            #location 27 
                            #vulnerability type NULL_DEREFERENCE
#fixed code
                                @Override
    public Bot findBot(String enterpriseId, String teamId) {
        AmazonS3 s3 = this.createS3Client();
        String fullKey = getBotKey(enterpriseId, teamId);
        if (isHistoricalDataEnabled()) {
            fullKey = fullKey + "-latest";
        }
        if (getObjectMetadata(s3, fullKey) == null && enterpriseId != null) {
            String nonGridKey = getBotKey(null, teamId);
            if (isHistoricalDataEnabled()) {
                nonGridKey = nonGridKey + "-latest";
            }
            S3Object nonGridObject = getObject(s3, nonGridKey);
            if (nonGridObject != null) {
                try {
                    Bot bot = toBot(nonGridObject);
                    bot.setEnterpriseId(enterpriseId); // the workspace seems to be in a Grid org now
                    save(s3, fullKey, JsonOps.toJsonString(bot), "AWS S3 putObject result of Bot data - {}");
                    return bot;
                } catch (Exception e) {
                    log.error("Failed to save a new Bot data for enterprise_id: {}, team_id: {}", enterpriseId, teamId);
                }
            }
        }
        S3Object s3Object = getObject(s3, fullKey);
        try {
            return toBot(s3Object);
        } catch (IOException e) {
            log.error("Failed to load Bot data for enterprise_id: {}, team_id: {}", enterpriseId, teamId);
            return null;
        }
    }