NameError in Spree/home#index

Showing /Users/jstrong/webapps/rails/spree/core/app/views/spree/shared/_nav_bar.html.erb where line #2 raised:

undefined local variable or method `spree_current_user' for #<#<Class:0x007fa3b16d13a0>:0x007fa3b16ccf80>

Extracted source (around line #2):

1: <nav id="top-nav-bar" class="columns omega ten"><ul id="nav-bar" class="inline" data-hook>
2: <% if spree_current_user %>
3: <li><%= link_to t(:my_account), spree.account_path %></li>
4: <li><%= link_to t(:logout), spree.destroy_user_session_path %></li>
5: <% else %>


Trace of template inclusion: /Users/jstrong/webapps/rails/spree/core/app/views/spree/shared/_header.html.erb, /Users/jstrong/webapps/rails/spree/core/app/views/spree/layouts/spree_application.html.erb

/Users/jstrong/webapps/rails/spree/core/app/helpers/spree/base_helper.rb:178:in `method_missing'
/Users/jstrong/webapps/rails/spree/core/app/views/spree/shared/_nav_bar.html.erb:2:in `_5f4eccc91f339600abb861a76fd5b1e1'
actionpack (3.2.5) lib/action_view/template.rb:145:in `block in render'
activesupport (3.2.5) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.5) lib/action_view/template.rb:143:in `render'
deface (0.9.1) lib/deface/action_view_extensions.rb:37:in `render'
actionpack (3.2.5) lib/action_view/renderer/partial_renderer.rb:265:in `render_partial'
actionpack (3.2.5) lib/action_view/renderer/partial_renderer.rb:238:in `block in render'
actionpack (3.2.5) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (3.2.5) lib/active_support/notifications.rb:123:in `block in instrument'
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activesupport (3.2.5) lib/active_support/notifications.rb:123:in `instrument'
actionpack (3.2.5) lib/action_view/renderer/abstract_renderer.rb:38:in `instrument'
actionpack (3.2.5) lib/action_view/renderer/partial_renderer.rb:237:in `render'
actionpack (3.2.5) lib/action_view/renderer/renderer.rb:41:in `render_partial'
actionpack (3.2.5) lib/action_view/renderer/renderer.rb:15:in `render'
actionpack (3.2.5) lib/action_view/helpers/rendering_helper.rb:24:in `render'
/Users/jstrong/webapps/rails/spree/core/app/views/spree/shared/_header.html.erb:3:in `_2a33cfa36af5c7c6d493d7fb0d54678d'
actionpack (3.2.5) lib/action_view/template.rb:145:in `block in render'
activesupport (3.2.5) lib/active_support/notifications.rb:125:in `instrument'
actionpack (3.2.5) lib/action_view/template.rb:143:in `render'
deface (0.9.1) lib/deface/action_view_extensions.rb:37:in `render'
actionpack (3.2.5) lib/action_view/renderer/partial_renderer.rb:265:in `render_partial'
actionpack (3.2.5) lib/action_view/renderer/partial_renderer.rb:238:in `block in render'
actionpack (3.2.5) lib/action_view/renderer/abstract_renderer.rb:38:in `block in instrument'
activesupport (3.2.5) lib/active_support/notifications.rb:123:in `block in instrument'
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/Users/jstrong/webapps/rails/spree/core/app/views/spree/layouts/spree_application.html.erb:19:in `_3e13c29a83d0aa824ee810f82cf60677'
actionpack (3.2.5) lib/action_view/template.rb:145:in `block in render'
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actionpack (3.2.5) lib/action_view/template.rb:143:in `render'
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/Users/jstrong/.rvm/rubies/ruby-1.9.2-p290/lib/ruby/1.9.1/benchmark.rb:310:in `realtime'
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/Users/jstrong/webapps/rails/spree/core/lib/spree/core/respond_with.rb:20:in `respond_with'
/Users/jstrong/webapps/rails/spree/core/app/controllers/spree/home_controller.rb:9:in `index'
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