Grafana in Horizontal Stack Card error


I have a simple card “Horizontal Stack”.

- entity: sensor.chauffage_e_watts
type: gauge
- aspect_ratio: 60%
type: iframe
url: >-
type: horizontal-stack

The Grafana works fine if alone but not when sharing the space with another card.
I have the message “Cannot read property ‘prefix’ of undefined”.

I tested putting:

  • 2 times the entity => It works
  • iframe alone => It works
  • 2 times iframe => Does not work