[Bug]: Can't generate image with ControlNet enabled

Nobody has claimed this yet.

### Checklist

- [X] The issue exists after disabling all extensions
- [X] The issue exists on a clean installation of webui
- [ ] The issue is caused by an extension, but I believe it is caused by a bug in the webui
- [X] The issue exists in the current version of the webui
- [ ] The issue has not been reported before recently
- [X] The issue has been reported before but has not been fixed yet

### What happened?

If I enable ControlNet at all I get an error. No setting I change makes it work.

### Steps to reproduce the problem

1. Activate ControlNet
2. Try to generate an image

### What should have happened?

Image generates

### What browsers do you use to access the UI ?

Brave

### Sysinfo

[sysinfo-2024-07-17-15-00.json](https://github.com/user-attachments/files/16267523/sysinfo-2024-07-17-15-00.json)

### Console logs

```Shell
https://pastebin.com/UtCqBX10
```

### Additional information

I am pretty sure nobody reported this exact issue, but I could have just missed it...

Start by reproducing the failure with ControlNet enabled, then inspect the linked console log at Pastebin and the attached sysinfo JSON for the reported error and environment details. Trace the relevant generation path from the failure; done means ControlNet can be enabled and an image generates successfully.

Written by the indexing model from the issue text.