I am trying to create generic hygrostat helper via UI but unlike other helpers when I select it it does not show any options/fields to fill just a window ’ Create generic hygrostat and Submit button, which does nothing when I press it…
I tried creating other helpers like Generic Thermostat and that shows fields to be filled with sensors etc and worked as expected.
I found some threads pointing to browser caching but opening in different browser (tried Edge and Chrome) did not make any difference
What could be a problem here?
Looks like a bug, please create an issue in the frontend repo .
karwosts
(karwosts)
September 11, 2026, 1:21pm
3
Already known and fixed for next:
opened 08:07PM - 04 Sep 26 UTC
closed 10:56PM - 04 Sep 26 UTC
### Checklist
- [x] I have updated to the latest available Home Assistant versi… on.
- [x] I have cleared the cache of my browser.
- [x] I have tried a different browser to see if it is related to my browser.
- [ ] I have tried reproducing the issue in [safe mode](https://www.home-assistant.io/blog/2023/11/01/release-202311/#restarting-into-safe-mode) to rule out problems with unsupported custom resources.
### Describe the issue you are experiencing
Empty generic hygrostat creation dialog:
<img width="620" height="181" alt="Image" src="https://github.com/user-attachments/assets/d52aa85b-a1a9-433c-8460-0d42fdc3d4fa" />
Upon inspection a following error occurs during dialog pop-up: `Uncaught (in promise) Error: Selector device_class not supported in initial form data`
### Describe the behavior you expected
A hygrostat configuration form is displayed.
### Steps to reproduce the issue
1. Go to Helpers
2. Click Create helper
3. Select Generic Hygrostat
### What version of Home Assistant Core has the issue?
2026.9.0
### What was the last working version of Home Assistant Core?
_No response_
### In which browser are you experiencing the issue?
Firefox 155.0; Edge 152.0.4191.62; Chrome (on Android) 152.0.7977.64
### Which operating system are you using to run this browser?
Windows 11 Pro 25H2 26200.8875; Android 17
### State of relevant entities
```txt
```
### Problem-relevant frontend configuration
```yaml
```
### JavaScript errors shown in your browser console/inspector
```txt
```
### Additional information
_No response_