What causes "Assistant ${selectedAssistantId} not found" in FlowiseAI/Flowise?

Open Assistants management and confirm an assistant with that id exists in this environment.

FlowiseAI/Flowise · error · Error

Assistant ${selectedAssistantId} not found

Error message

Assistant ${selectedAssistantId} not found

What it means

OpenAIAssistant agent looks up the configured assistant by id in the local `Assistant` repository (the Flowise-stored assistant record, not OpenAI). If `findOneBy({ id: selectedAssistantId })` returns null, the node throws — the assistant was deleted or the id is wrong before any OpenAI call is made.

Source

Thrown at packages/components/nodes/agents/OpenAIAssistant/OpenAIAssistant.ts:238

                    streamResponse(sseStreamer, chatId, e.message)
                }
                return formatResponse(e.message)
            }
        }

        let tools = nodeData.inputs?.tools
        tools = flatten(tools)
        const formattedTools = tools?.map((tool: any) => formatToOpenAIAssistantTool(tool)) ?? []

        const usedTools: IUsedTool[] = []
        const fileAnnotations = []
        const artifacts = []

        const assistant = await appDataSource.getRepository(databaseEntities['Assistant']).findOneBy({
            id: selectedAssistantId
        })

        if (!assistant) throw new Error(`Assistant ${selectedAssistantId} not found`)

        const credentialData = await getCredentialData(assistant.credential ?? '', options)
        const openAIApiKey = getCredentialParam('openAIApiKey', credentialData, nodeData)
        if (!openAIApiKey) throw new Error(`OpenAI ApiKey not found`)

        const openai = new OpenAI({ apiKey: openAIApiKey })

        // Start analytics
        const analyticHandlers = AnalyticHandler.getInstance(nodeData, options)
        await analyticHandlers.init()
        const parentIds = await analyticHandlers.onChainStart('OpenAIAssistant', input)

        try {
            const assistantDetails = JSON.parse(assistant.details)
            const openAIAssistantId = assistantDetails.id

            // Retrieve assistant
            const retrievedAssistant = await openai.beta.assistants.retrieve(openAIAssistantId)

View on GitHub (pinned to abe4a8601a)

Solutions

Open Assistants management and confirm an assistant with that id exists in this environment.
Re-select the assistant in the agent node's parameter to refresh the stored id.
If the assistant was deleted, recreate it and rebind the node.
If migrating between environments, export/import the assistant record alongside the flow.
Check the DB directly: `SELECT id FROM assistant WHERE id = '<id>'`.

Defensive patterns

Strategy: validation

Validate before calling

const repo = appDataSource.getRepository(databaseEntities['Assistant'])
const exists = await repo.exist({ where: { id: selectedAssistantId } })
if (!exists) throw new Error(`No assistant found in this environment for id ${selectedAssistantId}; create or import it first.`)

Try / catch

try {
  await assistantNode.run(nodeData, input, options)
} catch (e) {
  if (/Assistant .* not found/.test((e as Error).message)) refreshAssistantBinding()
  throw e
}

Prevention

Re-select the assistant in the node after environment migrations.
Export assistant records together with flows that reference them.
Avoid hard-coding assistant ids; let the picker store them.
Before runtime, verify the id exists via the Assistants API/UI.

When it happens

Trigger: selectedAssistantId refers to an assistant record that was deleted, the workspace/database was reset, the id was hand-edited, or a flow was imported into an environment that lacks that assistant row.

Common situations: Assistant deleted via UI after the agent node was configured; environment mismatch (dev flow pointing at a prod-only assistant id); DB migration lost rows; typo/paste error in the id.

Related errors

AI-assisted analysis of FlowiseAI/Flowise@abe4a8601a (2026-08-12). Data as JSON: /api/errors/269b273f02bbc6e9. Report an issue: GitHub.