N8n Reddit createComment node only processes first item (‘things’ undefined’)

[kent]

I have an n8n workflow that:

1. Scrapes Reddit posts
2. Filters out posts older than 12 hours or not marked “Relevant”
3. Drafts a comment with OpenAI
4. Appends each item to Google Sheets
5. Retrieves the row and posts the comment back to Reddit

When I supply a list of, say, 10 posts/URLs, the workflow only ever posts one comment and then stops. I’m trying to loop over all items, but I get an error about an undefined variable called things in the Create a comment in a post node.

Beyond that, I also want to:

• Filter out locked Reddit posts (i.e. don’t attempt to comment on posts where comments are locked)
• Automatically remove duplicates from my Google Sheet so I never post the same link twice
• Only post new items on each run (i.e. rows added in the last execution, not older rows)
• Keep the workflow running automatically, without manually triggering it, so it continually picks up new posts

Describe the problem/error/question

When I supply a list of, say, 10 posts/URLs, the workflow only ever posts one comment and then stops. I’m trying to loop over all items, but I get an error about an undefined variable called things in the Create a comment in a post (Reddit) node.

What is the error message (if any)?

Cannot read properties of undefined (reading 'things')

This error occurs in the Create a comment in a post node. If I enable Continue on Fail, the workflow runs without crashing but still only processes the first item

Please share your workflow

[Erick_Torres]

Add an If node before Create a comment in a post that checks that the ID field exists and that the post isn’t locked. If Reddit returns a locked: true field in the post’s JSON, use it.

Enable Continue on Fail. Although you’ve already set this up for some nodes, I recommend making sure it’s enabled specifically for Create a comment in a post. This prevents a single item error from interrupting the entire batch.

[kent]

Hi Erick,

Thank you for your response. I don’t actually have a locked flag or any json.locked variable, it’s coming back as undefined. And even with Continue on Fail enabled on the Create Comment node, it still aborts.

[Idan_rokach]

I get the same error… Let me know if you’ve solved it

[cutecatcode]

Hello @kent, try to add “pairedItem”: 1 right below the json key in your code, so it will be look like this

return items[0].json.data.children.map(child => {
  return {
    json: {
      display_name: child.data.display_name
    },
    pairedItem: 1
  };
});

[kent]

Hello,

Thank you for your response! I still get the same error though.

[Erick_Torres]

Use SplitInBatches before posting. Add a SplitInBatches node just before the Create a comment in a post node:

1. Get row(s) in sheet
2. SplitInBatches (batchSize: 1)
3. Create a comment in a post

This ensures that the Reddit node processes them one by one and not all at once.