I also did a tweak on the NEWN for the station that was causing the issue to use a different source for the conditions data.
The issue was his site was a meteotemplate site and they had no updates since 8-Jun-2018, so the JSON file we'd used (/template/plugins/steelSeries/ssMeteotemplate.php) produced JSON ending with "yesterday":} instead of "yesterday":""} or "yesterday":null}
This resulted in a JSON decode failure, so all the values were replaced by nulls, and the older common code 'barfed' on the non-numeric data. The change was to use template/pages/station/liveMesodata.php on their site (a simple comma-delimited stickertags file).
Whew... good thing I wrote both the regional network collector and the mesonet-map stuff.. that was a subtle error I'd not seen before.
I have a couple more tweaks to package for the mesonet-map scripts and will package them all in a V4.04 release soon.