#fixed code
                                public boolean limit() {
        String key = String.valueOf(System.currentTimeMillis() / 1000);
        Object result = null;
        try {
            RedisClusterConnection clusterConnection = jedis.getClusterConnection();
            JedisCluster jedisCluster = (JedisCluster) clusterConnection.getNativeConnection();
            result = jedisCluster.eval(script, Collections.singletonList(key), Collections.singletonList(String.valueOf(limit)));
            if (FAIL_CODE != (Long) result) {
                return true;
            } else {
                return false;
            }
        }catch (InvalidDataAccessApiUsageException e){
        }
        Jedis jedisConn = (Jedis)jedis.getConnection().getNativeConnection() ;
        result = jedisConn.eval(script, Collections.singletonList(key), Collections.singletonList(String.valueOf(limit)));

        if (FAIL_CODE != (Long) result) {
            return true;
        } else {
            return false;
        }
    }
#vulnerable code 
                                public boolean limit() {
        String key = String.valueOf(System.currentTimeMillis() / 1000);
        Object result = null;
        RedisClusterConnection clusterConnection = jedis.getClusterConnection();
        if (clusterConnection != null){
            JedisCluster jedisCluster = (JedisCluster) clusterConnection.getNativeConnection();
            result = jedisCluster.eval(script, Collections.singletonList(key), Collections.singletonList(String.valueOf(limit)));
        }else {
            Jedis jedis = (Jedis) clusterConnection.getNativeConnection();
            result = jedis.eval(script, Collections.singletonList(key), Collections.singletonList(String.valueOf(limit)));

        }

        if (FAIL_CODE != (Long) result) {
            return true;
        } else {
            return false;
        }
    } 
                            #location 9 
                            #vulnerability type NULL_DEREFERENCE