Problem in node ‘Basic LLM Chain‘ Cannot read properties of undefined (reading 'message')

[stronglong]

Describe the problem/error/question

My workflow is very basic but failed with error Cannot read properties of undefined (reading ‘message’)

What is the error message (if any)?

Problem in node ‘Basic LLM Chain‘ Cannot read properties of undefined (reading ‘message’)

Please share your workflow

Share the output returned by the last node

Last node just a data from google sheet

Information on your n8n setup

• n8n version: 1.81.6
• Database (default: SQLite): default
• n8n EXECUTIONS_PROCESS setting (default: own, main): default no change
• Running n8n via (Docker, npm, n8n cloud, desktop app): n8n cloud
• Operating system: Windows

[mohamed3nan]

Hi @stronglong Welcome to n8n community

What model are you using? I tried replicating your workflow with Gemini 2.5 Pro, and it’s working on my end.

[stronglong]

Hi thanks for your reply! I’m using deepseek/deepseek-chat:free
There is no error in the model node, it shown as green tick though
I think the problem is the Basic LLM Chain node.

[stronglong]

Ah no worries guys!! probably because the free model i’m using, it got overwhelm and no response returned
https://www.reddit.com/r/SillyTavernAI/comments/1ik95vr/deepseek_r1_on_openrouter_returning_blank_messages/?rdt=47817

I changed to another paid model and it returned just fine. Thank you!!