Started GET "/tracks/contexts" for 000.000.000.000 at 2014-06-09 11:27:45 +0200
Processing by ContextsController#index as HTML
  Rendered contexts/_context_listing.html.erb (15.0ms)
  Rendered contexts/_context_state_group.html.erb (17.4ms)
  Rendered contexts/_context_listing.html.erb (0.0ms)
  Rendered contexts/_context_state_group.html.erb (1.6ms)
  Rendered contexts/_context_state_group.html.erb (1.0ms)
  Rendered contexts/index.html.erb within layouts/application (20.6ms)
Completed 500 Internal Server Error in 95ms

ActionView::Template::Error (undefined method `length' for nil:NilClass):
    1: <div class="list-stategroup-contexts-container" id="list-<%= state %>-contexts-container">
    2:   <h2>
    3:     <span id="<%= state %>-contexts-count" class="badge"><%= context_state_group.length %></span>
    4:     <%= t("states.contexts."+ state) %>
    5:   </h2>
    6:   
  app/views/contexts/_context_state_group.html.erb:3:in `_app_views_contexts__context_state_group_html_erb___975863804958216483_46440980'
  app/views/contexts/index.html.erb:4:in `_app_views_contexts_index_html_erb__3552288753880373114_46384840'
  app/controllers/contexts_controller.rb:209:in `block in render_contexts_html'
  app/controllers/contexts_controller.rb:16:in `index'