An automation broke my Lovelace dashboards

Configuration
,
1

Hi *,

something weird happend today.
I wrote the following automation:

- alias: Thermostat Calibration
  id: thermostat3
  trigger:
  - platform: time
    at: '12:00:00'
  condition:
  - condition: time
    weekday:
    - mon
  action:
  - service: switch.turn_on
    data: {}
    entity_id: group.thermostat_calib

After I reloaded the automations, I couldn’t access my lovelace dashboards, config file editor or other parts anymore. Configuration and Supervisor were still accessible though.

I had to reboot the host system and had less than a minute to repair the configuration, until it “broke” again. I updated from 2021.4.4 to 2021.4.6 in the process.

The were no errors or warnings in the logs.

Does anyone have a clue what could have happend here?

Best,
Ck

2

There’s nothing unusual about that automation. It might simply be an unfortunate coincidence. The moment you reloaded automations happened to coincide with some other problem that was dormant and finally erupted.

3

You could try using the “Inspect/Dev Tools” function of your web browser to see what error messages are appearing on your console. It’s possible that a custom Lovelace card crashes your dashboard due to some bad error handling.

4

I found the problem.
After trying to recreate the situation, I found out that it was not the automation above.
Since I was in a hurry to modify the config before the UI got stuck, I did several changes that I lost track of.

I had underscores in the automation Ids. Apparently a bad idea.

5

That could not have been the root cause because I use underscores in Ids all the time without any problems.

alias: Scheduled Exterior Lighting
id: scheduled_exterior_lighting