ComfyUI execution error: 'NoneType' object has no attribute 'itemsize' Error | SwarmUI | Page 1

raven pine Dec 8, 2025, 9:58 PM

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It started out of blue moon , yesterday it was fine today i get this error, when trying to generate z-image pic.
Weird thing is if i disable all loras it will start working again,if i use any i get this error, anyone got some idea please?

woven lodge Dec 8, 2025, 10:02 PM

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yeah man same here 🙁

raven pine Dec 8, 2025, 10:04 PM

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attaching whole log

📎 error_log.txt

zenith atlas Dec 8, 2025, 10:24 PM

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seems like a bad comfy PR https://github.com/comfyanonymous/ComfyUI/pull/11173

GitHub

retune lowVramPatch VRAM accounting by rattus128 · Pull Request #1...

In the lowvram case, this now does its math in the model dtype post de-quantization. Account for that. The patching was also put back on the compute stream getting it off-peak so relax the MATH_FAC...

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If you want to bypass that until it's fixed:

Go to Server -> Backends -> Edit the comfy backend -> set AutoUpdate to disabled -> Save
Close Swarm
Open SwarmUI/dlbackend/comfy/ComfyUI in a terminal
Paste git reset --hard 8e889c535d1fc407bf27dbf8359eef9580f2ed60 and hit enter
Let it finish, relaunch swarm

That will push comfy back to before the broken commit. After comfy fixes it upstream, you can just go to Server->Backends again to reenable AutoUpdate.

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this is a major breaking bug so it will probably get a priority fix soon in comfy

#ComfyUI execution error: 'NoneType' object has no attribute 'itemsize' Error