Plugin breaks `inspec check`

[thheinen]

When running the inspec check command on a profile which uses inputs from this plugin, the following error appears:

Traceback (most recent call last):
        28: from /usr/bin/inspec:361:in `<main>'
        27: from /usr/bin/inspec:361:in `load'
        26: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-bin-4.18.51/bin/inspec:11:in `<top (required)>'
        25: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/base_cli.rb:35:in `start'
        24: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/thor-0.20.3/lib/thor/base.rb:466:in `start'
        23: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/thor-0.20.3/lib/thor.rb:387:in `dispatch'
        22: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/thor-0.20.3/lib/thor/invocation.rb:126:in `invoke_command'
        21: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/thor-0.20.3/lib/thor/command.rb:27:in `run'
        20: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/cli.rb:118:in `check'
        19: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/profile.rb:422:in `check'
        18: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/profile.rb:452:in `controls_count'
        17: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/profile.rb:195:in `params'
        16: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/profile.rb:598:in `load_params'
        15: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/profile.rb:605:in `load_checks_params'
        14: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/profile.rb:204:in `collect_tests'
        13: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/profile.rb:204:in `each'
        12: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/profile.rb:208:in `block in collect_tests'
        11: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/profile_context.rb:145:in `load_control_file'
        10: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/profile_context.rb:161:in `load_with_context'
         9: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/profile_context.rb:161:in `instance_eval'
         8: from ./controls/control-01.rb:6:in `load_with_context'
         7: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/control_eval_context.rb:191:in `block (2 levels) in create'
         6: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/input_registry.rb:311:in `block (2 levels) in <class:InputRegistry>'
         5: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/input_registry.rb:91:in `find_or_register_input'
         4: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/input_registry.rb:98:in `poll_plugins_for_update'
         3: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/input_registry.rb:98:in `each'
         2: from /opt/chef-workstation/embedded/lib/ruby/gems/2.6.0/gems/inspec-4.18.51/lib/inspec/input_registry.rb:99:in `block in poll_plugins_for_update'
         1: from /home/user/.inspec/gems/2.6.0/gems/inspec-chef-0.3.4/lib/inspec-chef/input.rb:40:in `fetch'
/home/user/.inspec/gems/2.6.0/gems/inspec-chef-0.3.4/lib/inspec-chef/input.rb:169:in `connect_to_chef_server': ERROR: Plugin inspec-chef needs configuration of chef endpoint, client name and api key. (RuntimeError)

chef-inspec 0.3.4
inspec 4.18.51
chef workstation 0.15.18