TypeError when using useChat onFinish with resume enabled

[pauksztello]

Description

When using resume with onFinish browser logs this error:

[browser] TypeError: Cannot read properties of undefined (reading 'state')

Tracked it down to this:

AI SDK Version

"ai": "^5.0.34",
"@ai-sdk/react": "^2.0.34",
"resumable-stream": "^2.2.3"

Code of Conduct

• I agree to follow this project's Code of Conduct

[ybelakov]

same here

[gr2m]

Potential reproducible test case, didn't try yet:
#8531 (comment)

[diegocodez]

I'm also getting this error. saw a fix was offered here but was closed for unknown reason
#8689

what's the status on this?

[fabiendevos]

Hey, any news on this? This is happening pretty frequently for us and we don't know of a workarround.

[0xDing]

Any updates?