Chat Webhook Triggers Workflow Without User Prompt

[yuvalnav]

Describe the problem/error/question

I’m using an n8n Chat Webhook embedded in another website.
Every day, the workflow connected to this chat webhook is triggered at least 4–5 times without any actual prompt being submitted by a user.

What is the error message (if any)?

Because the prompt is empty, the workflow fails. The ChatInput variable does not exist, but the execution still continues to the next node in the workflow.
I could add an IF node to handle empty input, but I want to prevent these unnecessary executions from happening in the first place, since they consume executions and may increase costs.

Please share your workflow/screenshots/recording

(Select the nodes on your canvas and use the keyboard shortcuts CMD+C/CTRL+C and CMD+V/CTRL+V to copy and paste the workflow.)
⚠️ WARNING ⚠️ If you have sensitive data in your workflow (like API keys), please remove it before sharing.

Share the output returned by the last node

expected that if no prompt enters the chat won't be triggered at all

Debug info

core

• n8nVersion: 2.17.5
• platform: docker (cloud)
• nodeJsVersion: 24.14.1
• nodeEnv: production
• database: sqlite
• executionMode: regular
• concurrency: 20
• license: enterprise (sandbox)

storage

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

pruning

• enabled: true
• maxAge: 720 hours
• maxCount: 25000 executions

client

• userAgent: mozilla/5.0 (windows nt 10.0; win64; x64) applewebkit/537.36 (khtml, like gecko) chrome/144.0.0.0 safari/537.36 edg/144.0.0.0
• isTouchDevice: false

Generated at: 2026-04-29T10:25:38.283Z

[n8n-assistant]

Hey @yuvalnav,

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-8058".

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-8058

[n8n-assistant]

Hey @yuvalnav, we'd like you to answer some questions regarding your issue before we move on:

• Could you clarify at what point the spurious triggers seem to occur — for example, do they happen as soon as the page with the chat widget loads, or at some other time (e.g., when a user opens the chat window but doesn't type anything)? This will help us determine whether the trigger is fired by a session initialization, a ping/handshake event, or something else.

[yuvalnav]

Hi,
This issue doesn't happen when refreshing the page.
I tested several scenarios, including entering text in the prompt without clicking the execution triangle-play button, and no execution session appeared in the workflow-execution tab. It seems to occur randomly.

[n8n-assistant]

Thank you for your answers, we'll proceed with the issue analysis