Flow executes random node

Questions
, , ,
1

Describe the issue/error/question

When I execute the flow everything goes fine until at some point it executes a random node, in this case the one named: Create JSON-items2. There is no conditions in the flow to execute that node.

What is the error message (if any)?

TypeError: Cannot read properties of undefined (reading 'map')
    at /Applications/n8n.app/Contents/Resources/app/node_modules/n8n-nodes-base/dist/nodes/Function:1:124
    at /Applications/n8n.app/Contents/Resources/app/node_modules/n8n-nodes-base/dist/nodes/Function:6:2
    at BaseHandler.apply (/Applications/n8n.app/Contents/Resources/app/node_modules/vm2/lib/bridge.js:479:11)
    at NodeVM.run (/Applications/n8n.app/Contents/Resources/app/node_modules/vm2/lib/nodevm.js:425:23)
    at Object.execute (/Applications/n8n.app/Contents/Resources/app/node_modules/n8n-nodes-base/dist/nodes/Function/Function.node.js:96:31)
    at Workflow.runNode (/Applications/n8n.app/Contents/Resources/app/node_modules/n8n-workflow/dist/src/Workflow.js:594:51)
    at /Applications/n8n.app/Contents/Resources/app/node_modules/n8n-core/dist/src/WorkflowExecute.js:537:64
    at processTicksAndRejections (node:internal/process/task_queues:96:5)

Please share the workflow

Share the output returned by the last node

Information on your n8n setup

  • n8n version: 1.6.0.
  • Database you’re using (default: SQLite):
  • Running n8n with the execution process [own(default), main]:
  • Running n8n via [Docker, npm, n8n.cloud, desktop app]: Mac Desktop App
2

Hey @Nelson_Paz_y_Mino,

Do you have a screenshot from the execution log showing the issue? I suspect the issue is coming from the merge node further down but without seeing the paths in the UI it is hard to say.

3

Hello, Jon. Please check the screenshots below:

image
image1200×684 86.9 KB

image
image1112×609 86.1 KB

image
image1190×657 90.1 KB

image
image1169×643 76.6 KB

4

Hey @Nelson_Paz_y_Mino,

Perfect so looking at that I suspect the issue is coming from the merge node trying to get an input 1 as nothing else is going to the input 2 of the other merge node and that is where it is checking.

Looking at the workflow you could maybe put in some extra logic to allow for values not existing but I think what I would do is start reworking it and seeing where things can be simplified.

5

Thanks Jon, the thing is that Input 2 has data to be sent to the Merge node. Input 1 has around 6500 rows and Input 2 around 3500. So it’s weird that the Merge node tries to get more data from Input 1. If just switch nodes (Input 1 to have around 3500 rows and Input 2 around 6500.), it works perfectly.