Slack trigger error

[kevinmarchese]

Bug Description

I'm running into this error when sending a slash command to n8n "Problem in node ‘Slack Trigger‘ Cannot read properties of undefined (reading 'type')"

To Reproduce

I set up a Slack trigger and added the node webhook to my Slash commands slack, tested it, and then it came back with the above error

Expected behavior

I expected to get JSON back from the Slack trigger

Operating System

Ubuntu 24.04

n8n Version

1.67.1

Node.js Version

v20.18.0

Database

PostgreSQL

Execution mode

main (default)

[Joffcom]

Hey @kevinmarchese,

We have created an internal ticket to look into this which we will be tracking as "GHC-445"

[Joffcom]

Hey @kevinmarchese

Can you share the full error output from the node?

Which filter are you using for the node as well the node is intended for use with the events API not the interactive endpoint for slash commands.

[kevinmarchese]

{ "errorMessage": "Cannot read properties of undefined (reading 'type')", "errorDetails": {}, "n8nDetails": { "n8nVersion": "1.67.1 (Self Hosted)", "binaryDataMode": "default", "stackTrace": [ "TypeError: Cannot read properties of undefined (reading 'type')", " at WebhookContext.webhook (/usr/local/lib/node_modules/n8n/node_modules/n8n-nodes-base/dist/nodes/Slack/SlackTrigger.node.js:293:42)", " at Workflow.runWebhook (/usr/local/lib/node_modules/n8n/node_modules/n8n-workflow/dist/Workflow.js:660:38)", " at Object.executeWebhook (/usr/local/lib/node_modules/n8n/dist/webhooks/webhook-helpers.js:144:48)", " at processTicksAndRejections (node:internal/process/task_queues:95:5)", " at /usr/local/lib/node_modules/n8n/dist/webhooks/test-webhooks.js:101:37" ] } }

[kevinmarchese]

Good to know! thank you I do need to enable events or use a webhook trigger instead I guess. Yeah, that is helpful thank you so much! and sorry not sure what you mean by "filter"

[kevinmarchese]

I was afraid that was the answer, I hate turning on the Events API, I might just do Webhooks

[Joffcom]

This does give me an idea for another trigger node in the future but for now... the webhook node would be the best option if you are building slash commands

[kevinmarchese]

Thank you so much and I'm glad I could be useful in some way! Cheer!

[Joffcom]

For now I am going to close this one as it doesn't look like there is a bug.