Gaps in graphs for Postfix application

Hi,
I have enabled the recently published Postfix application but somehow I get quite a lot of gaps in the graphs.
All other graphs appear fine (CPU, memory, network,etc.) but the Postfix application graph doesn’t.

I have the latest updated code, no errors… Any advice is appreciated.

[root@librenms librenms]# ./validate.php

Component Version
LibreNMS 271413e5f6f9923da6326d15357266f38ac50083
DB Schema 173
PHP 7.0.16
MySQL 5.5.52-MariaDB
RRDTool 1.4.8
SNMP NET-SNMP 5.7.2
==========================================================

[OK] Database connection successful
[root@librenms librenms]#