Text classifier throws an exception

[bratorange]

Bug Description

The classifier node would fail to output results and only show an error: Cannot read properties of undefined (reading 'additional_kwargs')

Relevant Process logs:
Cannot read properties of undefined (reading 'additional_kwargs')
Dec 26 00:01:46 Host n8n[37311]: TypeError: Cannot read properties of undefined (reading 'additional_kwargs')
Dec 26 00:01:46 Host n8n[37311]: at new BaseMessage (/nix/store/a6z8mqa9ly4yy0i06ps4p96mzilf9drg-n8n-1.70.1/lib/n8n/node_modules/.pnpm/@langchain[email protected]_>
Dec 26 00:01:46 Host n8n[37311]: at new HumanMessage (/nix/store/a6z8mqa9ly4yy0i06ps4p96mzilf9drg-n8n-1.70.1/lib/n8n/node_modules/.pnpm/@langchain[email protected]>
Dec 26 00:01:46 Host n8n[37311]: at ExecuteContext.execute (/nix/store/a6z8mqa9ly4yy0i06ps4p96mzilf9drg-n8n-1.70.1/lib/n8n/packages/@n8n/nodes-langchain/nodes>
Dec 26 00:01:46 Host n8n[37311]: at processTicksAndRejections (node:internal/process/task_queues:95:5)
Dec 26 00:01:46 Host n8n[37311]: at Workflow.runNode (/nix/store/a6z8mqa9ly4yy0i06ps4p96mzilf9drg-n8n-1.70.1/lib/n8n/packages/workflow/src/Workflow.ts:1383:8)
Dec 26 00:01:46 Host n8n[37311]: at /nix/store/a6z8mqa9ly4yy0i06ps4p96mzilf9drg-n8n-1.70.1/lib/n8n/packages/core/src/WorkflowExecute.ts:1162:27
Dec 26 00:01:46 Host n8n[37311]: at /nix/store/a6z8mqa9ly4yy0i06ps4p96mzilf9drg-n8n-1.70.1/lib/n8n/packages/core/src/WorkflowExecute.ts:1883:11

To Reproduce

Use workflow and setup an url in the "Http request" node for some csv test file.

{
"nodes": [
{
"parameters": {
"url": "Redacted",
"options": {
"response": {
"response": {
"responseFormat": "file"
}
}
}
},
"type": "n8n-nodes-base.httpRequest",
"typeVersion": 4.2,
"position": [
-80,
40
],
"id": "1f03dcef-7d21-4093-8eee-6927b0613e89",
"name": "HTTP Request"
},
{
"parameters": {},
"type": "n8n-nodes-base.manualTrigger",
"typeVersion": 1,
"position": [
-300,
40
],
"id": "240d1039-7d1c-4014-8db5-a5308de3a755",
"name": "When clicking ‘Test workflow’"
},
{
"parameters": {
"fileFormat": "csv",
"options": {
"delimiter": ";"
}
},
"id": "46a33e99-bff0-47c1-865c-0c26c89d3957",
"name": "Import CSV",
"type": "n8n-nodes-base.spreadsheetFile",
"position": [
160,
40
],
"typeVersion": 2
},
{
"parameters": {
"inputText": "={{ $json.replaceMe}}",
"categories": {
"categories": [
{
"category": "Essen"
},
{
"category": "Miete"
},
{
"category": "Einkommen"
}
]
},
"options": {
"fallback": "discard"
}
},
"type": "@n8n/n8n-nodes-langchain.textClassifier",
"typeVersion": 1,
"position": [
640,
-40
],
"id": "ff61e398-2b96-472b-a5d2-98d13556b750",
"name": "Text Classifier"
},
{
"parameters": {
"model": "llama3-groq-8b-8192-tool-use-preview",
"options": {}
},
"type": "@n8n/n8n-nodes-langchain.lmChatGroq",
"typeVersion": 1,
"position": [
780,
320
],
"id": "ba210d05-2b8b-4a5d-95e2-d19d3a51a353",
"name": "Groq Chat Model",
"credentials": {
"groqApi": {
"id": "Redacted",
"name": "Groq account"
}
}
},
{
"parameters": {
"fieldsToAggregate": {
"fieldToAggregate": [
{}
]
},
"options": {}
},
"type": "n8n-nodes-base.aggregate",
"typeVersion": 1,
"position": [
1120,
0
],
"id": "6108f66c-2f12-4044-84d9-8a43b39a99f4",
"name": "Aggregate"
}
],
"connections": {
"HTTP Request": {
"main": [
[
{
"node": "Import CSV",
"type": "main",
"index": 0
}
]
]
},
"When clicking ‘Test workflow’": {
"main": [
[
{
"node": "HTTP Request",
"type": "main",
"index": 0
}
]
]
},
"Import CSV": {
"main": [
[
{
"node": "Text Classifier",
"type": "main",
"index": 0
}
]
]
},
"Text Classifier": {
"main": [
[
{
"node": "Aggregate",
"type": "main",
"index": 0
}
],
[
{
"node": "Aggregate",
"type": "main",
"index": 0
}
],
[
{
"node": "Aggregate",
"type": "main",
"index": 0
}
],
[]
]
},
"Groq Chat Model": {
"ai_languageModel": [
[
{
"node": "Text Classifier",
"type": "ai_languageModel",
"index": 0
}
]
]
}
},
"pinData": {}
}

Expected behavior

I expect the classifier node to output data to the next node.

Operating System

Nixos-unstable

n8n Version

1.70.1

Node.js Version

23.2.0

Database

SQLite (default)

Execution mode

main (default)

[Joffcom]

Hey @bratorange,

We have created an internal ticket to look into this which we will be tracking as "N8N-8011"

[bratorange]

I have had another look and some parts of the input data seem to be undefined aswell: