As for the Error, do you have more Information or Logs? Is it setup in configuration.yaml or a subfile, or in an automation, dashboard etc.?
Which Integration is this and does it have a way to configure it from UI etc.?
Because just by this I’d assume it is internally and not because of configuration error.
Also, why is the name key empty, this should I think also throw a warning, albeit a different one.
Wow thanks for that, I wasn’t even aware of that function in HA.
Did some googling, and will check if it works tomorrow morning
As for the error, I deleted that card anyway, so no further need to investigate.