Error: Cannot read properties of null (reading 'name')

[cristianpaul0]

Getting:

1s
Run xt0rted/pull-request-comment-branch@v3
  with:
    repo_token: ***
Error: Cannot read properties of null (reading 'name')

From the following cofig

name: Issue Comment Workflow

on:
  issue_comment:
    types: [created]

jobs:
  handle_issue_comment:
    runs-on: [self-hosted, staging]

    steps:

      - name: Check comment content
        id: check_comment
        run: |
          if [[ "${{ github.event.comment.body }}" != *"deploy to staging"* ]]; then
            echo "Comment does not contain trigger keyword"
            exit 1
          fi
      - uses: xt0rted/pull-request-comment-branch@v3
        id: comment-branch

      - uses: actions/checkout@v3
        if: success()
        with:
          ref: ${{ steps.comment-branch.outputs.head_ref }}

Cant figure why with some PR it works fine and with others dont