when i click call on workflow it raise the above error in payload i saw: {assistant: null,…} assistant : null assistantOverrides : {clientMessages: ["workflow.node.started", "assistant.started", "transcript"]} squad : null workflowId : "dba9beab-167f-4743-a767-769fd217a0e4" workflowOverrides : {variableValues: {}} https://cdn.discordapp.com/attachments/1434777535484399687/1434777536092704899/image.png?ex=69099035&is=69083eb5&hm=f27bcda2f5f74a27656b8ab7f3bfc8b345211e8e3a99889d9a10cac993e4ea80&

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I understand the issue — the error “Key doesn’t allow assistantId ‘undefined’” usually means your workflow isn’t properly linked to an assistant instance or the assistantId isn’t being passed in the payload. I can help you identify where it’s missing, ensure your VAPI call includes a valid assistantId, and verify that the workflow is correctly associated with your assistant in the backend. Could you share whether this workflow was created directly under the assistant or imported separately? @krishnamoorthy

Hi krishnamoorthy, If you're encountering an error related to a "key doesn't allow assistant id," it might be due to a configuration or API limitation concerning the use of

assistantId

. Make sure the

assistantId

is being used in a context where it is supported, such as in [TargetPlan settings](https://docs.vapi.ai/changelog/2025/4/4). If you need further assistance with an API key configuration or usage pattern, please review your integration setup to ensure compatibility with the features you are trying to access. If this doesn’t resolve the issue, please let us know and we’ll be happy to step in and assist further.

i resolve that just by changing widget public id in assistant

Glad you were able to get this resolved. If anything else comes up or you need further assistance, we’re here to help.