Harmony Hub Error in Log - Polling Timer - Conversion of string not valid.

[AlfaChip]

Since the upgrade, I'm now receiving this error.

Exception in Hub_Polling_Timer_Elapsed : Conversion from string "" to type 'Double' is not valid.

I have no idea what this means, or what has changed.

on version 3.7.2.0

Current Date/Time: 5/8/2018 2:26:11 PM
HomeSeer Version: HS3 ZEE S2 Edition 3.0.0.435
Linux version: Linux HomeTrollerZeeS2V2 4.1.19-v7+ #858 SMP Tue Mar 15 15:56:00 GMT 2016 armv7l GNU/Linux System Uptime: 1 Day 3 Hours 1 Minute 57 Seconds
IP Address: 192.168.1.165
Number of Devices: 209
Number of Events: 16
Available Threads: 392
HSTouch Enabled: True
Event Threads: 0
Event Trigger Eval Queue: 0
Event Trigger Priority Eval Queue: 0
Device Exec Queue: 0
HSTouch Event Queue: 0
Email Send Queue: 0
Anti Virus Installed:

Enabled Plug-Ins
3.7.2.0: Harmony Hub
1.2.4.0: Honeywell WiFi Thermostat
3.0.0.83: weatherXML
3.0.1.190: Z-Wave

[Rien du Pre]

If you encounter problems, please delete all devices and ini file first.

Then restart the plugin or homeSeer