there is something wrong with AI Agent Call Code Tool

[llw168]

Bug Description

"Cannot read properties of undefined (reading 'content')"

To Reproduce

{
"nodes": [
{
"parameters": {
"public": true,
"options": {}
},
"type": "@n8n/n8n-nodes-langchain.chatTrigger",
"typeVersion": 1.1,
"position": [
-760,
-120
],
"id": "bd982f13-0712-451a-b9ab-ba5e9cab649f",
"name": "When chat message received",
"webhookId": "5dd02ca8-3943-4a78-b1f4-c9763e9f51c9"
},
{
"parameters": {
"model": {
"__rl": true,
"value": "nebulacoder-v6.0",
"mode": "list",
"cachedResultName": "nebulacoder-v6.0"
},
"options": {
"temperature": 0,
"timeout": 60000
}
},
"type": "@n8n/n8n-nodes-langchain.lmChatOpenAi",
"typeVersion": 1.2,
"position": [
-580,
120
],
"id": "2a47cd48-6a0f-4e4e-81c6-ed7c8bc7a704",
"name": "OpenAI Chat Model",
"credentials": {
"openAiApi": {
"id": "5xc8sEfOfRVrmv4G",
"name": "NebulaCoder60"
}
}
},
{
"parameters": {},
"type": "@n8n/n8n-nodes-langchain.memoryBufferWindow",
"typeVersion": 1.3,
"position": [
-180,
100
],
"id": "af8d82e7-eced-4ad7-977c-943f26d7a285",
"name": "Simple Memory",
"disabled": true
},
{
"parameters": {
"promptType": "define",
"text": "={{ $json.chatInput }}",
"options": {}
},
"id": "8fbf3834-056c-4d33-b433-8db77ea6104e",
"name": "AI Agent1",
"type": "@n8n/n8n-nodes-langchain.agent",
"typeVersion": 1.7,
"position": [
-280,
-100
],
"retryOnFail": false,
"maxTries": 2
},
{
"parameters": {
"description": "转换成大写字母"
},
"type": "@n8n/n8n-nodes-langchain.toolCode",
"typeVersion": 1.2,
"position": [
-20,
100
],
"id": "89498b5b-4520-4a13-b54d-8c4716dca831",
"name": "CodeTool-Upper",
"retryOnFail": false
},
{
"parameters": {
"description": "转换成小写字母",
"jsCode": "// Example: convert the incoming query to uppercase and return it\nreturn query.toLowerCase()"
},
"type": "@n8n/n8n-nodes-langchain.toolCode",
"typeVersion": 1.2,
"position": [
140,
80
],
"id": "4e22dbf8-2e0e-466a-be51-af0cd8684613",
"name": "CodeTool-Lower"
},
{
"parameters": {
"model": "=deepseek-chat",
"options": {}
},
"type": "@n8n/n8n-nodes-langchain.lmChatDeepSeek",
"typeVersion": 1,
"position": [
-380,
140
],
"id": "56e3b70f-ef1a-4cc5-95a1-de0a5e604353",
"name": "DeepSeek Chat Model",
"credentials": {
"deepSeekApi": {
"id": "kE1IWx8LVXwiQKT2",
"name": "DeepSeek account"
}
}
}
],
"connections": {
"When chat message received": {
"main": [
[
{
"node": "AI Agent1",
"type": "main",
"index": 0
}
]
]
},
"OpenAI Chat Model": {
"ai_languageModel": [
[
{
"node": "AI Agent1",
"type": "ai_languageModel",
"index": 0
}
]
]
},
"Simple Memory": {
"ai_memory": [
[
{
"node": "AI Agent1",
"type": "ai_memory",
"index": 0
}
]
]
},
"AI Agent1": {
"main": [
[]
]
},
"CodeTool-Upper": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"CodeTool-Lower": {
"ai_tool": [
[
{
"node": "AI Agent1",
"type": "ai_tool",
"index": 0
}
]
]
},
"DeepSeek Chat Model": {
"ai_languageModel": [
[]
]
}
},
"pinData": {},
"meta": {
"templateCredsSetupCompleted": true,
"instanceId": "ebe24453bfcbfa9d4c406f11f08412aebd5e2a2ef2785d0da8c93c6340379075"
}
}

Expected behavior

111

Operating System

windows 10

n8n Version

1.93.0

Node.js Version

v22.15.1

Database

SQLite (default)

Execution mode

main (default)

[Joffcom]

Hey @llw168,

We have created an internal ticket to look into this which we will be tracking as "GHC-2183"

[roger-Guo]

@llw168
I replaced the large language model with deepseek, and changed the prompt word to convert "good" into uppercase. It works OK, so it should be a problem with the model. I suggest you change the model.

[llw168]

@roger-Guo
Thank you for your reply. The n8n I am using is locally deployed and used a privately deployed model. The same workflow can also be run on the official website of n8n, but it cannot be run locally. There is no apparent reason from the logs.

Or can I edit the input and output of the Agent to the LLM model?