When using “chat memory manager”, the information is not recorded completely

[tigflanker]

Bug Description

Hello n8n developers, when I was using the “chat memory manager”, I found that the information was not recorded completely.
I only set up two chat memory manager modules, the first one to record user input, and the second one to read it.
However, when I input in the order of 1, 2, 3, 4, 5, 6, 7, I found that the memory module did not correctly record the information.

The pattern seems to be: the first time it records normally, the second time it overwrites the first record; the third time it extends the record normally (at this point there are two records), the fourth time it overwrites the third record.

To Reproduce

Here is the workflow:

{
"nodes": [
{
"parameters": {
"options": {}
},
"type": "@n8n/n8n-nodes-langchain.chatTrigger",
"typeVersion": 1.1,
"position": [
-540,
0
],
"id": "56adf3f1-6dc5-42b6-ae44-775f90412175",
"name": "When chat message received",
"webhookId": "e20be05c-d689-401d-9b59-1dcb9bd3ff36"
},
{
"parameters": {
"mode": "insert",
"messages": {
"messageValues": [
{
"type": "user",
"message": "={{ $json.chatInput }}"
}
]
}
},
"type": "@n8n/n8n-nodes-langchain.memoryManager",
"typeVersion": 1.1,
"position": [
-320,
0
],
"id": "d655e19a-afd5-4122-8717-a8e3b055ad57",
"name": "Chat Memory Manager"
},
{
"parameters": {
"options": {}
},
"type": "@n8n/n8n-nodes-langchain.memoryManager",
"typeVersion": 1.1,
"position": [
56,
0
],
"id": "f46b34c8-fe0b-493a-8189-cd1c882c3c8f",
"name": "Chat Memory Manager1"
},
{
"parameters": {
"contextWindowLength": 20
},
"type": "@n8n/n8n-nodes-langchain.memoryPostgresChat",
"typeVersion": 1.3,
"position": [
-240,
220
],
"id": "c880c1fc-945a-4b1a-917d-20105cf2e32c",
"name": "Postgres Chat Memory",
"credentials": {
"postgres": {
"id": "NJGoko5aK43WWtl1",
"name": "Postgres account"
}
}
},
{
"parameters": {
"sessionIdType": "customKey",
"sessionKey": "={{ $('When chat message received').item.json.sessionId }}",
"contextWindowLength": 20
},
"type": "@n8n/n8n-nodes-langchain.memoryPostgresChat",
"typeVersion": 1.3,
"position": [
160,
220
],
"id": "aa7d65fb-6f4c-4c6a-81d4-b804bd1578b2",
"name": "Postgres Chat Memory1",
"credentials": {
"postgres": {
"id": "NJGoko5aK43WWtl1",
"name": "Postgres account"
}
}
}
],
"connections": {
"When chat message received": {
"main": [
[
{
"node": "Chat Memory Manager",
"type": "main",
"index": 0
}
]
]
},
"Chat Memory Manager": {
"main": [
[
{
"node": "Chat Memory Manager1",
"type": "main",
"index": 0
}
]
]
},
"Postgres Chat Memory": {
"ai_memory": [
[
{
"node": "Chat Memory Manager",
"type": "ai_memory",
"index": 0
}
]
]
},
"Postgres Chat Memory1": {
"ai_memory": [
[
{
"node": "Chat Memory Manager1",
"type": "ai_memory",
"index": 0
}
]
]
}
},
"pinData": {},
"meta": {
"templateId": "PT1i+zU92Ii5O2XCObkhfHJR5h9rNJTpiCIkYJk9jHU=",
"templateCredsSetupCompleted": true,
"instanceId": "6c539a3c2a224c3bfb4e755552bac62e8eab064df7b664034faaed76747796b9"
}
}

Expected behavior

As above.

Operating System

Ubuntu 2204

n8n Version

1.94.1

Node.js Version

docker used

Database

SQLite (default)

Execution mode

main (default)

[Joffcom]

Hey @tigflanker,

We have created an internal ticket to look into this which we will be tracking as "GHC-2253"