[Bug]: Cannot do inpainting

[Rabcor]

Checklist

• The issue exists after disabling all extensions
• 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
• The issue exists in the current version of the webui
• The issue has not been reported before recently
• The issue has been reported before but has not been fixed yet

What happened?

Nothing happens.

Steps to reproduce the problem

Try to do inpainting on blackwell gpu (setup with torch 2.7.0+cu128 and xformers 0.0.30)

What should have happened?

Inpainting should work.

What browsers do you use to access the UI ?

Google Chrome

Sysinfo

sysinfo-2025-06-24-02-04.json

Console logs

Traceback (most recent call last):███████████████████████████████| 32/32 [00:13<00:00,  2.14it/s]
  File "/opt/sdwebui/venv/lib/python3.11/site-packages/gradio/routes.py", line 488, in run_predict
    output = await app.get_blocks().process_api(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/sdwebui/venv/lib/python3.11/site-packages/gradio/blocks.py", line 1429, in process_api
    inputs = self.preprocess_data(fn_index, inputs, state)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/sdwebui/venv/lib/python3.11/site-packages/gradio/blocks.py", line 1239, in preprocess_data
    processed_input.append(block.preprocess(inputs[i]))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/sdwebui/venv/lib/python3.11/site-packages/gradio/components/image.py", line 270, in preprocess
    assert isinstance(x, dict)
           ^^^^^^^^^^^^^^^^^^^
AssertionError

Sometimes I get this instead:

Traceback (most recent call last):
  File "/opt/sdwebui/venv/lib/python3.11/site-packages/gradio/routes.py", line 488, in run_predict
    output = await app.get_blocks().process_api(
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/sdwebui/venv/lib/python3.11/site-packages/gradio/blocks.py", line 1429, in process_api
    inputs = self.preprocess_data(fn_index, inputs, state)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/sdwebui/venv/lib/python3.11/site-packages/gradio/blocks.py", line 1239, in preprocess_data
    processed_input.append(block.preprocess(inputs[i]))
                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/sdwebui/venv/lib/python3.11/site-packages/gradio/components/image.py", line 290, in preprocess
    mask_im = processing_utils.decode_base64_to_image(mask)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/sdwebui/venv/lib/python3.11/site-packages/gradio/processing_utils.py", line 58, in decode_base64_to_image
    image_encoded = extract_base64_data(encoding)
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/sdwebui/venv/lib/python3.11/site-packages/gradio/processing_utils.py", line 49, in extract_base64_data
    return x.rsplit(",", 1)[-1]
           ^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'rsplit'

Additional information

No response

[w-e-w]

coming from we believe that this has to do with your 5080 GPU

• Nvidia Blackwell 50XX GPU instructions (updated) #16818 (comment)

but looking at the logs you provided it does not seem to me that this has anything to do with pytorch or your GPU 5080

from what I can tell for some reason the user interface / webpage is broken

I cannot be certain this case but this seems similar to what would happen sometimes when you have multiple tabs of web UI (webpage) open in browser, then you install / update / enable / disable an extension, after clicking apply to applying and restarting the server, you then use another webui tab that was open before the restart to generated an image, then you might see similar error

this is because when changing extension configurations it might also cause some UI elements to change, and when you try to communicate on our old web page that sends the old configurations to the server things don't line up properly and cause things to break

I remember some one say that this might also happen just by restarting the server but me personally have not experienced this

---

I guess by this point you have already tried restarting your server and reloading the web page
if restart and reload didn't fix it then I would suggest a clean installation

If you do so also I recommend you use git and switch to dev branch

[Rabcor]

I guess by this point you have already tried restarting your server and reloading the web page if restart and reload didn't fix it then I would suggest a clean installation

If you do so also I recommend you use git and switch to dev branch

Yes, and I already tried doing a clean installation, it already kinda is a clean installation; but I have not tried the dev branch. If you say it seems the webui is broken maybe using another browser would work 🤔

Yup, I didn't have another browser on hand, but I tried running it in electron, and it worked fine there.

My browser is ungoogled chromium, installed from the cachyos official package.

I believe the binary for my current version comes from here: https://github.com/ungoogled-software/ungoogled-chromium/archive/137.0.7151.119-1.tar.gz

seems like it's happening with default settings.