Chat node does not. work with streaming and file upload at same time

[akin-demir]

Bug Description

I am trying to use chat trigger node to communicate with agent and upload a file so its content get parsed.
In production mode enabled (execution not editor) if I attempted to upload a file to via chat file upload (enabled) and have the response mode set to (Streaming) the node fails with the following error

{
    "code": 422,
    "message": "Failed to parse request body",
    "hint": "No number after minus sign in JSON at position 1 (line 1 column 2)",
    "stacktrace": "ResponseError: Failed to parse request body\n    at parseBody (/opt/homebrew/lib/node_modules/n8n/src/middlewares/body-parser.ts:70:10)\n    at processTicksAndRejections (node:internal/process/task_queues:105:5)\n    at parseRequestBody (/opt/homebrew/lib/node_modules/n8n/src/webhooks/webhook-helpers.ts:861:5)\n    at Object.executeWebhook (/opt/homebrew/lib/node_modules/n8n/src/webhooks/webhook-helpers.ts:435:3)"
}

while the n8n system logs

Error in handling webhook request POST /webhook/ab30eacf-87b6-45cc-8ef1-599825e34813/chat: Failed to parse request body
422 Failed to parse request body

To Reproduce

1. Create chat trigger node
2. Set response to "Streaming" (from node Options)
3. Allow Files Upload set to True (from node Options)
4. Make Chat Publicly available as True (from node Option)
5. Access the chat via the web hook URL
6. Upload any file (PDF my choice) + write something in the chat and send

Expected behavior

Expected it works fine upload file and submit text

Debug Info

Debug info

core

• n8nVersion: 1.121.3
• platform: npm
• nodeJsVersion: 24.6.0
• nodeEnv: undefined
• database: sqlite
• executionMode: regular
• concurrency: -1
• license: community
• consumerId: unknown

storage

• success: all
• error: all
• progress: false
• manual: true
• binaryMode: memory

pruning

• enabled: true
• maxAge: 336 hours
• maxCount: 10000 executions

client

• userAgent: mozilla/5.0 (macintosh; intel mac os x 10_15_7) applewebkit/537.36 (khtml, like gecko) chrome/142.0.0.0 safari/537.36
• isTouchDevice: false

Generated at: 2025-12-08T16:12:32.346Z

Operating System

Mac Tahoe 26.1

n8n Version

1.121.3

Node.js Version

24.6.0

Database

SQLite (default)

Execution mode

main (default)

Hosting

n8n cloud

[n8n-assistant]

Hey @akin-demir,

Thank you for reaching out! We’ve received your issue and are looking into it. To help us track this internally, we’ve created a Linear ticket with the reference: "GHC-5822".

We’ll keep you updated as we make progress, but if you have any additional details or context to share, feel free to add them here - it’s always helpful!

Thanks for your patience and for bringing this to our attention.

---

For INTERNAL use only: GHC-5822

[disassembledd]

Thank you for raising this issue, the first step of triage is completed, and it has been routed internally for further investigation.

Reproduction Steps

Deployment: Self-hosted Docker n8nio/n8n:1.122.4

• Added chat trigger and AI agent nodes
• Attached AWS Bedrock Nova Pro model
• Toggled chat trigger to make the chat publicly available
• Changed the response mode to streaming and enabled file upload in the chat trigger
• Prompted via web UI and within the editor

When attempting to upload a file and prompt "what is in this file" via the public chat, the UI responds with "Error: Failed to receive response." In my case, no execution data is being logged in that scenario. If I prompt the model without an attachment it responds as expected and execution data is saved.

When attempting to upload a file and prompt via the in-editor chat, it successfully parses and the model responds.

#triage:complete

[krisn0x]

Thank you @akin-demir, @disassembledd, routed to internal team.