pg_query() Query Failed when viewing graphs of hosts

[Pessimism6-Corned]

We are seeing the following error when viewing the "Graphs" shortcut under some hosts:

I believe this is trying to display a pie chart, as all other line graphs look perfectly fine, and when attempting to build a pie chart on the dashboard I see:



I believe this to have started happening on 7.0.14, but can't say for certain as its not a function that I use regularly.

Any body seen this before? Any help would be massively appreciated

Thanks