Graphic dBm not show Huawei s5320

Hi all, I added Huawei switch s5320 to my librenms, enabled the sensor module but dBm graphic not show. In output poller.php shows NAN in update RRD.

root@librenms:/opt/librenms# ./validate.php

Component Version
LibreNMS 1.36-65-gdf724a7
DB Schema 235
PHP 7.0.25-0ubuntu0.16.04.1
MySQL 10.0.33-MariaDB-0ubuntu0.16.04.1
RRDTool 1.5.5
SNMP NET-SNMP 5.7.3
====================================

[OK] Database connection successful
[OK] Database schema correct

https://p.libren.ms/view/94de0d53

Can you help in solving this problem? Thanks in advance!