undefined method `first' for Rack::Response on Grape 0.12.0

[jpaas]

I just upgraded my project from grape 0.11.0 to 0.12.0 and it appears that Rack::Logjam::Grape::Middleware no longer works...

(NoMethodError)undefined method `first' for #<Rack::Response:0x007f9df738d118>
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-logjam-0.2.1/lib/rack/logjam/grape/middleware.rb:18:in `after'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-0.12.0/lib/grape/middleware/base.rb:25:in `call!'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-0.12.0/lib/grape/middleware/base.rb:18:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-librato-1.1.0/lib/grape-librato/middleware.rb:17:in `block in call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/librato-rack-0.4.5/lib/librato/collector/aggregator.rb:70:in `measure'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-librato-1.1.0/lib/grape-librato/middleware.rb:16:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-0.12.0/lib/grape/middleware/error.rb:27:in `block in call!'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-0.12.0/lib/grape/middleware/error.rb:26:in `catch'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-0.12.0/lib/grape/middleware/error.rb:26:in `call!'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-0.12.0/lib/grape/middleware/base.rb:18:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/head.rb:13:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/builder.rb:153:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-0.12.0/lib/grape/endpoint.rb:196:in `call!'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-0.12.0/lib/grape/endpoint.rb:184:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-mount-0.8.3/lib/rack/mount/route_set.rb:152:in `block in call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-mount-0.8.3/lib/rack/mount/code_generation.rb:96:in `block in recognize'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-mount-0.8.3/lib/rack/mount/code_generation.rb:68:in `optimized_each'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-mount-0.8.3/lib/rack/mount/code_generation.rb:95:in `recognize'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-mount-0.8.3/lib/rack/mount/route_set.rb:141:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-0.12.0/lib/grape/api.rb:98:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-0.12.0/lib/grape/api.rb:33:in `call!'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/grape-0.12.0/lib/grape/api.rb:29:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/routing/mapper.rb:51:in `serve'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/journey/router.rb:43:in `block in serve'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/journey/router.rb:30:in `each'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/journey/router.rb:30:in `serve'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/routing/route_set.rb:821:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/ember-cli-rails-0.3.2/lib/ember-cli/middleware.rb:14:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-cors-0.4.0/lib/rack/cors.rb:80:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/warden-1.2.3/lib/warden/manager.rb:35:in `block in call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/warden-1.2.3/lib/warden/manager.rb:34:in `catch'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/warden-1.2.3/lib/warden/manager.rb:34:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/etag.rb:24:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/conditionalget.rb:25:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/head.rb:13:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/middleware/params_parser.rb:27:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/middleware/flash.rb:260:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/session/abstract/id.rb:225:in `context'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/session/abstract/id.rb:220:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/middleware/cookies.rb:560:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/activerecord-4.2.3/lib/active_record/query_cache.rb:36:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/activerecord-4.2.3/lib/active_record/connection_adapters/abstract/connection_pool.rb:653:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/activerecord-4.2.3/lib/active_record/migration.rb:377:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/middleware/callbacks.rb:29:in `block in call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/activesupport-4.2.3/lib/active_support/callbacks.rb:84:in `run_callbacks'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/middleware/callbacks.rb:27:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/middleware/reloader.rb:73:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/middleware/remote_ip.rb:78:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/middleware/show_exceptions.rb:30:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/railties-4.2.3/lib/rails/rack/logger.rb:38:in `call_app'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/railties-4.2.3/lib/rails/rack/logger.rb:20:in `block in call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/activesupport-4.2.3/lib/active_support/tagged_logging.rb:68:in `block in tagged'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/activesupport-4.2.3/lib/active_support/tagged_logging.rb:26:in `tagged'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/activesupport-4.2.3/lib/active_support/tagged_logging.rb:68:in `tagged'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/railties-4.2.3/lib/rails/rack/logger.rb:20:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/middleware/request_id.rb:21:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/methodoverride.rb:22:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/runtime.rb:18:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/activesupport-4.2.3/lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/lock.rb:17:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/actionpack-4.2.3/lib/action_dispatch/middleware/static.rb:116:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/sendfile.rb:113:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-cors-0.4.0/lib/rack/cors.rb:80:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/railties-4.2.3/lib/rails/engine.rb:518:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/railties-4.2.3/lib/rails/application.rb:165:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/rack-1.6.4/lib/rack/content_length.rb:15:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/puma-2.11.3/lib/puma/server.rb:507:in `handle_request'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/puma-2.11.3/lib/puma/server.rb:375:in `process_client'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/puma-2.11.3/lib/puma/server.rb:262:in `block in run'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/puma-2.11.3/lib/puma/thread_pool.rb:104:in `call'
/Users/jpaas/.rvm/gems/ruby-2.2.2@imdcloud/gems/puma-2.11.3/lib/puma/thread_pool.rb:104:in `block in spawn_thread'