Save Image with Metadata Custom Node No longer working

[gonzalu]

Prerequisites

• I am running the latest version of ComfyUI
• I have searched existing issues to make sure this isn't a duplicate
• I have tested with all custom nodes disabled (see how)

What happened?

Error after latest release of frontend and ComfyUI

[ComfyUI Image Metadata Extension] WARNING: Positive prompt is empty!
[ComfyUI Image Metadata Extension] WARNING: Steps are empty, full metadata won't be added!
[ComfyUI Image Metadata Extension] WARNING: Seed not found in pnginfo_dict!

Node is:

https://github.com/edelvarden/comfyui_image_metadata_extension

Steps to Reproduce

How is this affecting you?

Crashes ComfyUI completely

ComfyUI Frontend Version

1.28.8

Browser

Edge

Console Errors

Logs

Additional Context

No response

┆Issue is synchronized with this Notion page by Unito

[dosubot]

Hi @gonzalu! I'm Dosu and I’m helping the ComfyUI_frontend team.

Recent ComfyUI frontend updates have introduced breaking changes that affect how metadata is handled and passed to custom nodes. There are known issues where nodes that rely on metadata (like prompt, steps, or seed) may receive empty or missing data, leading to warnings and crashes in extensions such as the Image Metadata Extension. This is often due to changes in the internal structure of metadata (for example, the widgets_values array) and stricter validation in newer versions, which can break compatibility with custom nodes that haven't been updated to match the new format. Similar regressions have been reported with other metadata-related features and custom nodes after recent updates [example][example][example].

If you are seeing these warnings and crashes, it is likely due to incompatibility between the Image Metadata Extension and the latest ComfyUI frontend. The most effective workaround is to check for updates to the extension or temporarily disable it until it is updated for compatibility. If you continue to experience crashes even with all custom nodes disabled, try rebuilding your workflow from scratch, as legacy workflows may also trigger issues due to stricter validation in recent versions.

To reply, just mention @dosu.

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[gonzalu]

Looks like it is ComfyUI Core. Not Front end.

Just downgraded the Core to the previous release and it is working fine. Front End is 1.28.8 and it is fine...