"Cannot read properties of undefined (reading 'node')" error

how is this related to original post ?

Any Updates on this? It’s so annoying — don’t even know what I’m looking for.

Very annoing problem still present.
I can “resolve” only changing queue mode to “regular” disabling slaves…

I didn’t find a fix but found a work around for my use-case. I was receiving this error using n8n cloud when my workflow had a loop with a lot of referencing and steps inside the loop. I decided to make a new workflow with no loop and haven’t seen the error since.

This is a work around because running each execution seperately is more expensive and I still don’t know exactly what was causing the issue but Atleast my production workflow is working better now🤷

We have the same error

{
  "errorMessage": "Cannot read properties of undefined (reading 'error')",
  "errorDetails": {},
  "n8nDetails": {
    "n8nVersion": "1.102.4 (Self Hosted)",
    "binaryDataMode": "default",
    "stackTrace": [
      "TypeError: Cannot read properties of undefined (reading 'error')",
      "    at ExecuteContext.router (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/@n8n+n8n-nodes-langchain@file+packages+@n8n+nodes-langchain_7e9d43189da28db518476f7779d5ed6f/node_modules/@n8n/n8n-nodes-langchain/nodes/vendors/OpenAi/actions/router.ts:65:64)",
      "    at processTicksAndRejections (node:internal/process/task_queues:105:5)",
      "    at ExecuteContext.execute (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/@n8n+n8n-nodes-langchain@file+packages+@n8n+nodes-langchain_7e9d43189da28db518476f7779d5ed6f/node_modules/@n8n/n8n-nodes-langchain/nodes/vendors/OpenAi/OpenAi.node.ts:16:10)",
      "    at WorkflowExecute.runNode (/usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1212:9)",
      "    at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:1582:27",
      "    at /usr/local/lib/node_modules/n8n/node_modules/.pnpm/n8n-core@[email protected][email protected][email protected]_/node_modules/n8n-core/src/execution-engine/workflow-execute.ts:2153:11"
    ]
  }
}

The errors happened in an OpenAI Message a model node

Problem in node ‘AI Agent2‘

Cannot read properties of undefined (reading ‘nodeName’)

I also meet this problem. I think this issue need to solved by the n8n team. I think this is bug.