vagrant-berkshelf bug

Berksfile

# can be empty

Vagrantfile

Vagrant.configure('2') do |config|
  config.vm.box = 'base'

  config.vm.define :foo do |ctrl|
    ctrl.berkshelf.enabled = true
    ctrl.vm.hostname = "foo"
  end

  config.vm.define :bar do |ctrl|
    ctrl.berkshelf.enabled = false
    ctrl.berkshelf.berksfile_path = 'NoBerksfileHere'
    ctrl.vm.hostname = "bar"
  end
end

vagrant up bar yields this error:

vagrant-berkshelf-2.0.1/lib/berkshelf/vagrant/action/install.rb:52:in `warn_disabled_but_berksfile_exists': undefined method `berkshelf' for nil:NilClass (NoMethodError)

did you find a solution to this? i have the same issue