railsのフィーチャースペックをpoltergeistを用いてjenkins上で回しているのですが、

エラーメッセージ

One or more errors were raised in the Javascript code on the page. If you don't care about these errors, you can ignore them by setting js_errors: false in your Poltergeist configuration (see documentation for details)....

スタックトレース

One or more errors were raised in the Javascript code on the page. If you don't care about these errors, you can ignore them by setting js_errors: false in your Poltergeist configuration (see documentation for details).

ReferenceError: Can't find variable: $td
ReferenceError: Can't find variable: $td
at h ttp://127.0.0.1:38079/assets/admin/application.js:14065
[object Object]
[object Object]
at h ttp://www.googletagmanager.com/gtm.js?id=HOGE:51
at h ttp://www.googletagmanager.com/gtm.js?id=HOGE:59 (Capybara::Poltergeist::JavascriptError)
Capybara::Poltergeist::JavascriptError:
One or more errors were raised in the Javascript code on the page. If you don't care about these errors, you can ignore them by setting js_errors: false in your Poltergeist configuration (see documentation for details).

ReferenceError: Can't find variable: $td
ReferenceError: Can't find variable: $td
at h ttp://127.0.0.1:38079/assets/admin/application.js:14065
[object Object]
[object Object]
at h ttp://www.googletagmanager.com/gtm.js?id=HOGE:51
at h ttp://www.googletagmanager.com/gtm.js?id=HOGE:59
./spec/features/admin/hoge_spec.rb:237:in `block (4 levels) in '

のように、javascriptのエラーが出て、落ちてしまいます(hoge_specの名前およびurlのidを変更しています。また、urlを含めるなと言われたので、httpをh ttpとしています)。上の情報は一例で、エラーが起きる場所は毎回やるたびに変わっています。
spec_helper.rbの内容は以下です。

# This file is copied to spec/ when you run 'rails generate rspec:install'
ENV["RAILS_ENV"] ||= 'test'
require File.expand_path("../../config/environment", __FILE__)
require 'rspec/rails'
require 'rspec/autorun'
require 'simplecov'
require 'simplecov-rcov'
SimpleCov.formatter = SimpleCov::Formatter::RcovFormatter
SimpleCov.start do
  add_filter '/vendor/'
end

# Requires supporting ruby files with custom matchers and macros, etc,
# in spec/support/ and its subdirectories.
Dir[Rails.root.join("spec/support/**/*.rb")].each { |f| require f }

# Checks for pending migrations before tests are run.
# If you are not using ActiveRecord, you can remove this line.
ActiveRecord::Migration.check_pending! if defined?(ActiveRecord::Migration)

include Warden::Test::Helpers
Warden.test_mode!

RSpec.configure do |config|
  # ## Mock Framework
  #
  # If you prefer to use mocha, flexmock or RR, uncomment the appropriate line:
  #
  # config.mock_with :mocha
  # config.mock_with :flexmock
  # config.mock_with :rr

  # Remove this line if you're not using ActiveRecord or ActiveRecord fixtures
  config.fixture_path = "#{::Rails.root}/spec/fixtures"

  # If you're not using ActiveRecord, or you'd prefer not to run each of your
  # examples within a transaction, remove the following line or assign false
  # instead of true.
  config.use_transactional_fixtures = !true

  # If true, the base class of anonymous controllers will be inferred
  # automatically. This will be the default behavior in future versions of
  # rspec-rails.
  config.infer_base_class_for_anonymous_controllers = false

  # Run specs in random order to surface order dependencies. If you find an
  # order dependency and want to debug it, you can fix the order by providing
  # the seed, which is printed after each run.
  #     --seed 1234
  config.order = "random"

  config.include FactoryGirl::Syntax::Methods

  config.before(:suite) do
    DatabaseCleaner.strategy = :truncation
    DatabaseCleaner.clean_with :truncation
  end

  config.before :each do
    DatabaseCleaner.start
  end

  config.after :each do
    DatabaseCleaner.clean
  end

  config.before :all do
    FactoryGirl.reload
  end

  config.include Devise::TestHelpers, type: :controller
  config.include Capybara::DSL
  config.include Login
  config.include NewWindow

  config.before do
    if page.driver.try :headers
      page.driver.headers = { 'User-Agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36' }
    end
  end

  config.after do |example|
    example = example.example
    if example.metadata[:type] == :feature and Capybara.javascript_driver == :poltergeist and example.exception.present?
      page.save_screenshot "spec/screenshot/#{example.full_description}.png"
    end
  end
end

Capybara.default_wait_time = ENV['WAIT_TIME'] || 3

require 'capybara/rspec'
require 'capybara/rails'
# require 'selenium-webdriver'
require 'capybara/poltergeist'
Phantomjs.path

# Capybara.javascript_driver = :selenium_chrome
# Capybara.javascript_driver = :selenium_firefox
Capybara.javascript_driver = :poltergeist

Capybara.register_driver :poltergeist do |app|
  driver = Capybara::Poltergeist::Driver.new(app, js_errors: false, timeout: 10000, phantomjs: Phantomjs.path, phantomjs_options: ['--ignore-ssl-errors=yes','--ssl-protocol=any'])
  driver.headers = { 'User-Agent' => 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36' }
  driver
end

Capybara.register_driver :selenium_chrome do |app|
  Capybara::Selenium::Driver.new(app, :browser => :chrome)
end

Capybara.register_driver :selenium_firefox do |app|
  profile = Selenium::WebDriver::Firefox::Profile.new
  ua = 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36'
  profile["general.useragent.override"] = ua
  opts = { browser: :firefox, profile: profile }
  Capybara::Selenium::Driver.new(app, opts)
end

以上のように、js_errors: falseをつけているにもかかわらず、javascriptのエラーが起こったらテストが落ちます。
javascriptのエラーを治そうにも、tagmanager由来のエラーもあるようで、難しいかなと思いっています。
ローカル環境で同一のテストを回したところjavascriptのエラーでテストが落ちなかったので、jenkins環境によるのかなと思っています。
どうすればjavascriptのエラーを無視して、rspecのテストを落ちないようにできるでしょうか。

環境:
CentOS release 6.4 (Final)
ruby 2.1.5p273
Rails 4.0.5
Jenkins ver. 1.552
phantomjs 1.9.2
poltergeist (1.6.0)