Pronto is failing to post reviews to github pull request

[skatkov]

Using CirlcleCI with github.

Here is my Gemfile.tools

source 'https://rubygems.org'

git_source(:github) do |repo_name|
  repo_name = "#{repo_name}/#{repo_name}" unless repo_name.include?("/")
  "https://github.com/#{repo_name}.git"
end

gem 'pronto'
gem 'oj'
gem 'pronto-rubocop', require: false
gem 'pronto-eslint', require: false
gem 'pronto-flay', require: false
gem 'pronto-brakeman', require: false
gem 'pronto-rails_schema', require: false
gem 'pronto-reek', require: false
gem 'pronto-fasterer', require: false
gem 'pronto-simplecov', require: false
gem 'pronto-rails_best_practices', require: false
gem 'danger'

And my config.yml (using CircleCI):

jobs:
  lint:
    environment:
      - BUNDLE_GEMFILE: Gemfile.tools
    docker:
      # specify the version you desire here
      - image: circleci/ruby:2.4.2-stretch-node-browsers
        environment:
          RAILS_ENV: test
          RACK_ENV: test

    working_directory: ~/repo

    steps:
      - checkout
      - restore_cache:
          keys:
          - v1-tools-dependencies-{{ checksum "Gemfile.tools" }}
          # fallback to using the latest cache if no exact match is found
          - v1-tools-dependencies-

      - run:
          name: install cmake
          command: |
            sudo apt-get install cmake

      - run:
          name: install dependencies
          command: |
            bundle check --path vendor/bundle || bundle install --jobs=4 --retry=3 --path vendor/bundle

      - save_cache:
          paths:
            - ./vendor/bundle
          key: v1-tools-dependencies-{{ checksum "Gemfile.tools.lock" }}


      - run:
          name: Danger code review
          command: |
            bundle exec danger

      - run:
          name: Pronto code analysis
          command: |
            bundle exec pronto run -c origin/master -f github_status -f github_pr_review --exit-code
      - store_artifacts:
          path: ./tmp

I'm from time to time run into this issue, then pronto fails to post review:

Failed to post: POST https://api.github.com/repos/skatkov/amzstore/pulls/258/reviews: 422 - Invalid request.

For 'properties/position', nil is not a number. // See: https://developer.github.com/v3/pulls/reviews/#create-a-pull-request-review
1 Pronto messages posted to GitHub

I've SSH'ed into machine, but my tmp/ folder for project is missing.
I tried to reproduce locally by running bundle exec pronto run --staged and couldn't reproduce

I'm a bit lost trying to understand reason for such failure. I would greatly appreciate, if anyone could advice me how to better understand what is the problem?

[nbekirov]

Maybe this is related to #149.
There are also some debugging suggestions in the comments that might be helpful.