TypeError: argument of type 'NoneType' is not iterable when using Hires Fix via API

[Katchiiko]

Getting a TypeError: argument of type 'NoneType' is not iterable when trying to use Hires Fix hrough the API endpoint /sdapi/v1/txt2img. File "C:\Stable Diffusion2\webui\modules\processing.py", line 1405, in sample
if hasattr(self, 'hr_additional_modules') and 'Use same choices' not in self.hr_additional_modules:
TypeError: argument of type 'NoneType' is not iterable

OS: Windows
Stable Diffusion Forge last version
API: FastAPI (built-in webui API)
Python version: python: 3.10.6
torch: 2.3.1+cu121

set COMMANDLINE_ARGS= --autolaunch --xformers --api --listen --port 7860 --share --disable-nan-check

request to /sdapi/v1/txt2img with Hires Fix parameters:

{
  "prompt": "a beautiful sunset over mountains",
  "negative_prompt": "low quality, blurry",
  "steps": 25,
  "cfg_scale": 7,
  "width": 512,
  "height": 512,
  "sampler_name": "DPM++ 2M Karras",
  "enable_hr": true,
  "hr_scale": 2.0,
  "hr_upscaler": "Latent",
  "hr_second_pass_steps": 15,
  "denoising_strength": 0.5
}

Error occurs during image processing

The same Hires Fix settings work fine through the web UI
API works correctly when enable_hr is set to false
I'm a complete noob and wrote almost all of the code using Claude AI. It worked perfectly, and I can send prompts via Telegram and receive images, but when I wanted to add a hires fix, nothing helped.

[dleung18]

I got the same issue. Anyone has the fix?