Cannot Save after adding one line to slack node

I been running into this issue and cant figure out what is wrong. Every time I make a small change in one of the nodes or in this case Slack node, it gives me this error:

If I remove this part from the node: it saves no problem. Is this some issue on our AWS ? thank you

  "nodes": [
      "parameters": {
        "channel": "={{$node[\"Convert_to_Json\"].json[\"new_value\"][\"channel\"][\"id\"]}}",
        "text": "=HelpDesk ticket created: ******",
        "attachments": [],
        "otherOptions": {
          "thread_ts": "={{$node[\"Convert_to_Json\"].json[\"new_value\"][\"message\"][\"ts\"]}}"
      "name": "Slack6",
      "type": "n8n-nodes-base.slack",
      "typeVersion": 1,
      "position": [
      "credentials": {
        "slackApi": "Artie "
  "connections": {}

Is the workflow active? If so, can you save it without a problem if it is inactive and you make the change then?

Same thing happens if I make it inactive. This started after one of the updates I believe, I didn’t make any changes for a while and all of the sudden I cant edit one of my big workflows and I created this one as a test, it was saving fine for some time until I added https:// line. Same thing happens if I add new slack node and just add credentials.

Which trigger is the workflow using?

it is using the webhook, but seems like this happens when ever I make small change anywhere in the workflow

Could this be the same issue as I am having ?

Is it really only when using that url in a workflow? My first thought on seeing that error is there could be a reverse proxy between you and n8n which is doing something funky.

Hey @Artie_Sobol,

Did you find a solution?

I tested this out with the latest version v0.144.0 and it is working as expected for me. Are you facing the issue with other workflows as well?

We running this in AWS and have EC2 Rules set up to guide the webhook to the right spot. I did some testing over the weekend and seems like I was able to get it back working with new instance that doesnt have any of the rules for webhooks. Do you think something is off with HTTPS:443 routes? What confuses me the most is that it saves while i start new workflow and keep adding nodes, but soon as I add HTTP or slack node at the end of my workflow it gives me that error.