I’m building a Facebook Messenger chatbot using n8n with a webhook. The issue I’m facing is that the webhook keeps retriggering, which causes my bot to repeatedly send the same message (spamming in production).
Here is what’s happening:
The webhook verification with GET works correctly.
When I receive a POST event from Facebook, my workflow processes it, but the same event gets triggered again and again.
As a result, the bot keeps sending the same message multiple times in an infinite loop.
I suspect something is wrong with how my POST webhook response or filtering is set up, but I’m not sure where the issue is.
I debugged your workflow very carefully and try to identify the issue but because of less details and also i don’t have the execution logs so that i can debug the flow very deeply,so i can give you few reasons that may solve your issue :-
1.Ensure Webhook Acknowledgment :- The Webhook Node must return a proper HTTP response (200 OK) with an acknowledgment after processing the event.
2.Avoid Circular Processing :- Ensure that the AI Agent Node or HTTP Request Node does not trigger the Webhook Node again inadvertently. Implement checks to avoid reprocessing the same data.
3.Use Unique Identifiers :- If the same event is processed multiple times, use a unique identifier (e.g., message ID) to check and prevent duplicates.
I simply put a ‘response to webhook’ node after the ‘webhook’ node, so it gets back an instant 200 OK response. I have tried put it after the ‘HTTP Request’ node aswell, but it did not worked that way.
