Logic apps - Error: "Http request failed as the content stream was not valid: 'Found invalid data"

Hello,

I started to learn Azure and playing around with Logic Apps. I created a logic app to get a sensor value from my home automation api:
This is what I usually get from my GET request:
```
{"entity_id": "input_number.climate_comfort", "state": "24.0", "attributes": {"initial": null, "editable": true, "min": 19.0, "max": 30.0, "step": 1.0, "mode": "slider", "unit_of_measurement": "a", "friendly_name": "climate_comfort"}, "last_changed": "2022-01-18T10:44:25.998911+00:00", "last_updated": "2022-01-18T12:07:21.225023+00:00", "context": {"id": "9138e322eca86c50ee4a357b9815f869", "parent_id": null, "user_id": null}}
```

The logic app stops with that error:

Any idea what is wrong with my data?

Thanks, Thomas