0pdd: TypeError: no implicit conversion of String into Integer

https://sentry.io/zerocracy/0pdd-j0/issues/553746512/

TypeError: no implicit conversion of String into Integer
  objects/commit_tickets.rb:39:in `dig'
    unless @sources.config.dig('alerts', 'suppress', 'on-found-puzzle')
  objects/commit_tickets.rb:39:in `submit'
    unless @sources.config.dig('alerts', 'suppress', 'on-found-puzzle')
  objects/emailed_tickets.rb:35:in `submit'
    done = @tickets.submit(puzzle)
  objects/sentry_tickets.rb:46:in `submit'
    @tickets.submit(puzzle)
  objects/puzzles.rb:91:in `block in expose'
    issue = tickets.submit(puzzle)
...
(62 additional frame(s) were not displayed)

TypeError: no implicit conversion of String into Integer