checkr - stack level too deep

Gemfile

source "https://rubygems.org"

gem 'activesupport', '4.2.3'
gem 'checkr-official', '1.0.2'

Gemfile.lock

GEM
  remote: https://rubygems.org/
  specs:
    activesupport (4.2.3)
      i18n (~> 0.7)
      json (~> 1.7, >= 1.7.7)
      minitest (~> 5.1)
      thread_safe (~> 0.3, >= 0.3.4)
      tzinfo (~> 1.1)
    checkr-official (1.0.2)
      json (~> 1.8.1)
      mime-types (>= 1.25, < 3.0)
      rest-client (~> 1.4)
    domain_name (0.5.24)
      unf (>= 0.0.5, < 1.0.0)
    http-cookie (1.0.2)
      domain_name (~> 0.5)
    i18n (0.7.0)
    json (1.8.3)
    mime-types (2.6.1)
    minitest (5.8.0)
    netrc (0.10.3)
    rest-client (1.8.0)
      http-cookie (>= 1.0.2, < 2.0)
      mime-types (>= 1.16, < 3.0)
      netrc (~> 0.7)
    thread_safe (0.3.5)
    tzinfo (1.2.2)
      thread_safe (~> 0.1)
    unf (0.1.4)
      unf_ext
    unf_ext (0.0.7.1)

PLATFORMS
  ruby

DEPENDENCIES
  activesupport (= 4.2.3)
  checkr-official (= 1.0.2)

BUNDLED WITH
   1.10.5

output

## Make sure to run bundle install 
## then run test.rb with bundle exec

➜  checkr-test-case  bundle exec ruby test.rb     
/Users/jclay/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.3/lib/active_support/core_ext/object/json.rb:32:in `to_json_with_active_support_encoder': stack level too deep (SystemStackError)
	from /Users/jclay/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.3/lib/active_support/core_ext/object/json.rb:34:in `to_json_with_active_support_encoder'
	from /Users/jclay/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.3/lib/active_support/core_ext/object/json.rb:34:in `to_json_with_active_support_encoder'
	from /Users/jclay/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.3/lib/active_support/core_ext/object/json.rb:34:in `to_json_with_active_support_encoder'
	from /Users/jclay/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.3/lib/active_support/core_ext/object/json.rb:34:in `to_json_with_active_support_encoder'
	from /Users/jclay/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.3/lib/active_support/core_ext/object/json.rb:34:in `to_json_with_active_support_encoder'
	from /Users/jclay/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.3/lib/active_support/core_ext/object/json.rb:34:in `to_json_with_active_support_encoder'
	from /Users/jclay/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.3/lib/active_support/core_ext/object/json.rb:34:in `to_json_with_active_support_encoder'
	from /Users/jclay/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/activesupport-4.2.3/lib/active_support/core_ext/object/json.rb:34:in `to_json_with_active_support_encoder'
	 ... 9347 levels...
	from /Users/jclay/.rbenv/versions/2.2.2/lib/ruby/gems/2.2.0/gems/checkr-official-1.0.2/lib/checkr/api_class.rb:164:in `to_s'
	from test.rb:11:in `puts'
	from test.rb:11:in `puts'
	from test.rb:11:in `<main>'
➜  checkr-test-case  

test.rb

require 'active_support/core_ext/object'


require 'checkr'
Checkr.api_key = 'your_key'

report = Checkr::Report.create({
  package: "tasker_pro",
  candidate_id: "b28ac43920df4c9c5997a06d"
})

puts report