Describe the problem/error/question
Hi! I have an issue with my Messenger automation. I’m running it locally (via Docker) and using ngrok for tunneling. The workflow executes only once. I have the flow activated (top-right toggle is on).
When I send a message to the Messenger page, which is supported by the n8n automation, it replies only once. After that, the workflow stops working (I have to manually execute it again to respond to another message — even though the workflow is active the whole time).
Does anyone know how to fix this? I’ve watched a lot of tutorials on YouTube and my setup and schema are exactly the same.
What is the error message (if any)?
Only error message is from terminal, where ngrok is running (first execute return 200 code with success, next one 404).
Please share your workflow
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## Describe the problem/error/question
Hi! I have an issue with my Messenger automation. I'm running it locally (via Docker) and using ngrok for tunneling. The workflow executes only once. I have the flow activated (top-right toggle is on).
When I send a message to the Messenger page, which is supported by the n8n automation, it replies only once. After that, the workflow stops working (I have to manually execute it again to respond to another message — even though the workflow is active the whole time).
Does anyone know how to fix this? I’ve watched a lot of tutorials on YouTube and my setup and schema are exactly the same.
## What is the error message (if any)?
Only error message is from terminal, where ngrok is running (first execute return 200 code with success, next one 404).
## Please share your workflow
{
"nodes": [
{
"parameters": {
"multipleMethods": true,
"path": "=bf677959-dfc5-4803-bcd8-36f4aaac109f",
"responseMode": "responseNode",
"options": {}
},
"type": "n8n-nodes-base.webhook",
"typeVersion": 2,
"position": [
240,
-32
],
"id": "97e61a3e-0963-4aed-bcdc-2cbcaecf4ae9",
"name": "Webhook",
"webhookId": "bf677959-dfc5-4803-bcd8-36f4aaac109f"
},
{
"parameters": {
"conditions": {
"options": {
"caseSensitive": true,
"leftValue": "",
"typeValidation": "strict",
"version": 2
},
"conditions": [
{
"id": "4164e2db-d24b-4765-9519-47e6d2792256",
"leftValue": "={{ $json.query['hub.mode'] }}",
"rightValue": "subscribe",
"operator": {
"type": "string",
"operation": "equals",
"name": "filter.operator.equals"
}
},
{
"id": "daddbe5f-2a49-4576-bae1-a2b8a8bf4d56",
"leftValue": "={{ $json.query['hub.verify_token'] }}",
"rightValue": "aichatbot",
"operator": {
"type": "string",
"operation": "equals",
"name": "filter.operator.equals"
}
}
],
"combinator": "and"
},
"options": {}
},
"type": "n8n-nodes-base.if",
"typeVersion": 2.2,
"position": [
544,
-48
],
"id": "b8b0c07b-5936-4678-ac86-c25707041357",
"name": "If"
},
{
"parameters": {
"respondWith": "text",
"responseBody": "={{ $json.query['hub.challenge'] }}",
"options": {}
},
"type": "n8n-nodes-base.respondToWebhook",
"typeVersion": 1.4,
"position": [
816,
-160
],
"id": "4c0adbc4-405f-4d25-8ecb-c86ff83daec1",
"name": "Respond to Webhook"
},
{
"parameters": {
"promptType": "define",
"text": "=Odpowiadasz na następujące pytanie:{{ $json.body.entry[0].messaging[0].message.text }}. Korzystasz z informacji zawartych w. Na jego podstawie masz wygenerować odpowiedź dla klienta. Masz zachować środki grzecznościowe i pisać profesjonalnie. Odpowiadasz tylko na zadanie pytania. ",
"options": {
"systemMessage": "Jesteś pomocnym asystentem dla firmy produkującej domki modułowe mozal.pl. Twoim zadaniem jest odpowiedź na pytania klientów. "
}
},
"type": "@n8n/n8n-nodes-langchain.agent",
"typeVersion": 2.1,
"position": [
656,
144
],
"id": "df42d2cf-5ce2-4bfd-9281-75ada47d6284",
"name": "AI Agent"
},
{
"parameters": {
"sessionIdType": "customKey",
"sessionKey": "={{ $json.body.entry[0].messaging[0].sender.id }}",
"contextWindowLength": 10
},
"type": "@n8n/n8n-nodes-langchain.memoryBufferWindow",
"typeVersion": 1.3,
"position": [
672,
352
],
"id": "2191cd05-8854-4576-8c6c-690fd0221fae",
"name": "Simple Memory"
},
{
"parameters": {
"method": "POST",
"url": "=https://graph.facebook.com/v23.0/{{ $('Webhook').item.json.body.entry[0].messaging[0].recipient.id }}/messages?access_token=EAAfyLlLlLR0BPMBfqhLdqjZBQnI9YF8FUlbT8GIhZBwUzZC0juZBW5NitWWBIVjRvPsO0mChr8WhtgW0SSxq6sOIqHbC283ZAVZCnIUDIILr7Kjn98MZBrpSqkHk0ltWvnRdw2yEs5t0AJgOJLFQOs9b4aUczkVgG3wBoT3FQEREQrNL23704XO6KiHh3fnQDxWZCZAy0Gkl0igZDZD",
"sendBody": true,
"specifyBody": "json",
"jsonBody": "={\n \"recipient\": {\n \"id\": \"{{ $('Webhook').item.json.body.entry[0].messaging[0].sender.id }}\"\n },\n \"messaging_type\": \"RESPONSE\",\n \"message\": {\n \"text\": \n\"{{ $json.outputAI }}\"\n }\n}",
"options": {}
},
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
1216,
144
],
"id": "05503440-5ed6-4699-b6f1-592e832caed7",
"name": "HTTP Request"
},
{
"parameters": {
"assignments": {
"assignments": [
{
"id": "ff839087-3d40-4499-a5cc-a63fc8d9d2c4",
"name": "outputAI",
"value": "={{ $json.output.replace(/[\\r\\n]+/g, \"\") }}",
"type": "string"
}
]
},
"options": {}
},
"type": "n8n-nodes-base.set",
"typeVersion": 3.4,
"position": [
1008,
144
],
"id": "0bb29983-e800-4614-889a-de159f29de0f",
"name": "Edit Fields"
},
{
"parameters": {
"modelName": "models/gemini-2.0-flash-lite",
"options": {}
},
"type": "@n8n/n8n-nodes-langchain.lmChatGoogleGemini",
"typeVersion": 1,
"position": [
496,
336
],
"id": "e467945e-0b6b-46ea-8097-c50827dee7be",
"name": "Google Gemini Chat Model",
"credentials": {
"googlePalmApi": {
"id": "apIdqo2pSn279AQE",
"name": "Google Gemini(PaLM) Api account"
}
}
},
{
"parameters": {
"url": "https://mozal.pl/pytania-i-odpowiedzi/",
"options": {}
},
"type": "n8n-nodes-base.httpRequestTool",
"typeVersion": 4.2,
"position": [
912,
352
],
"id": "139e702f-9f0b-4391-87f9-37e5dec022a2",
"name": "HTTP Request1"
}
],
"connections": {
"Webhook": {
"main": [
[
{
"node": "If",
"type": "main",
"index": 0
}
],
[
{
"node": "AI Agent",
"type": "main",
"index": 0
}
]
]
},
"If": {
"main": [
[
{
"node": "Respond to Webhook",
"type": "main",
"index": 0
}
]
]
},
"AI Agent": {
"main": [
[
{
"node": "Edit Fields",
"type": "main",
"index": 0
}
]
]
},
"Simple Memory": {
"ai_memory": [
[
{
"node": "AI Agent",
"type": "ai_memory",
"index": 0
}
]
]
},
"Edit Fields": {
"main": [
[
{
"node": "HTTP Request",
"type": "main",
"index": 0
}
]
]
},
"Google Gemini Chat Model": {
"ai_languageModel": [
[
{
"node": "AI Agent",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"HTTP Request1": {
"ai_tool": [
[
{
"node": "AI Agent",
"type": "ai_tool",
"index": 0
}
]
]
}
},
"pinData": {},
"meta": {
"templateCredsSetupCompleted": true,
"instanceId": "3a824ab7603bc9f6f3caa2291a5561749c83331d235cd8b014de0f1132fb190a"
}
}
## Share the output returned by the last node
## Information on your n8n setup
- **n8n version:** 1.102.4
- **Database (default: SQLite):** SQLite
- **n8n EXECUTIONS_PROCESS setting (default: own, main):** I can't find it, I hope it doesn't matter
- **Running n8n via (Docker, npm, n8n cloud, desktop app):** docker, ngrok
- **Operating system:** MacOSX Sequoia 15.5
Share the output returned by the last node
Information on your n8n setup
- n8n version: 1.102.4
- Database (default: SQLite): SQLite
- n8n EXECUTIONS_PROCESS setting (default: own, main): I can’t find it, I hope it doesn’t matter
- Running n8n via (Docker, npm, n8n cloud, desktop app): docker, ngrok
- Operating system: MacOSX Sequoia 15.5
