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lastStep undefined issue #4147

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tjk opened this issue Dec 18, 2024 · 3 comments
Open

lastStep undefined issue #4147

tjk opened this issue Dec 18, 2024 · 3 comments
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bug Something isn't working

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@tjk
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tjk commented Dec 18, 2024 •
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Description

Still need to understand why this is happening... but there seems to at least be a problem in the code.

Comment + check for nullish lastStep here:

ai/packages/ai/core/generate-text/stream-text.ts

Lines 534 to 536 in 952cbdf

// from last step (when there are errors there may be no last step)
const lastStep = recordedSteps[recordedSteps.length - 1];
if (lastStep) {

but then accessed without care here:

ai/packages/ai/core/generate-text/stream-text.ts

Line 569 in 952cbdf

toolCalls: lastStep.toolCalls,

Produces this stack trace:

Cause: TypeError: Cannot read properties of undefined (reading 'toolCalls')
    at Object.flush (turbopack://[project]/node_modules/.pnpm/ai@4.0.20_react@19.0.0-rc-45804af1-20241021_zod@3.23.8/node_modules/ai/core/generate-text/stream-text.ts:571:21)
  569 |             toolCalls: lastStep.toolCalls,
  570 |             toolResults: lastStep.toolResults,
> 571 |             request: lastStep.request ?? {},
      |                     ^
  572 |             response: lastStep.response,
  573 |             warnings: lastStep.warnings,

AI provider

Anthropic. Don't get this error With OpenAI, I think. Probably something to do with tools declaration, but would be nice to get better feedback than just that stack above.
@tjk tjk added the bug Something isn't working label Dec 18, 2024
@tjk
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tjk commented Dec 18, 2024

It looks like this issue might be related (and what I'm running into): #3422

@lgrammel
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lgrammel commented Dec 19, 2024 •
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Can you share the code you use to call streamText?

Anthropic does not support structured outputs with streamText (we use tool calls with streamObject/generateObject), so this might not work with Anthropic.

@Taofeeq-deru
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I'm getting this same error, using steamText not steamObject, with openai

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@tjk @lgrammel @Taofeeq-deru