TypeError: t.jsonData is undefined

[Laurent Sesquès]

After a fresh deploy of cs:~llama-charmers-next/grafana-8, and adding relations to prometheus2 and influxdb, showing the sources in the web UI gives the following error:

An unexpected error happened
Details
TypeError: t.jsonData is undefined

    in t
    in div
    in t
    in form
    in div
    in div
    in t
    in div
    in div
    in div
    in t
    in t
    in div
    in t
    in t
    in x
    in ConnectWithCleanUp(Connect(t))
    in r
    in Unknown
    in t
    in Unknown
    in h
    in Unknown
    in Unknown
    in t
    in t
    in l

Looking at the data_source table in sqlite:
sqlite> select name, json_data from data_source;
prometheus2 - Juju generated source|
influxdb - Juju generated source|

I solved it manually with:
sqlite> update data_source set json_data='{}';

[Eric Chen (eric-chen)]

This charm is no longer being actively maintained. Please consider using the new Canonical Observability Stack instead.
(https://charmhub.io/topics/canonical-observability-stack)
I will close this issue