Unable to log out, and navigation list not correct

Reproduce: Log in. Click around in navigation. Log out. Error.

It seems that we make two calls to action destroy in controller session:

Started DELETE "/signout" for 127.0.0.1 at 2014-09-11 23:35:52 +0200
Processing by SessionsController#destroy as HTML
  Parameters: {"authenticity_token"=>"EnuvYj+haJBAfNMZM9wHht8J39FEqL0UbNbGvMs7Hrw="}
sign_out
  User Load (0.2ms)  SELECT  "users".* FROM "users"  WHERE "users"."remember_token" = 'adadf53cb92fde2725119922e01837fa1412d73c' LIMIT 1
   (0.1ms)  begin transaction
  SQL (0.3ms)  UPDATE "users" SET "remember_token" = ?, "updated_at" = ? WHERE "users"."id" = 2  [["remember_token", "25a2e6e37190e032118c890662f98e4f92465023"], ["updated_at", "2014-09-11 21:35:52.643454"]]
   (5.8ms)  commit transaction
Redirected to http://localhost:3000/signin
Completed 302 Found in 10ms (ActiveRecord: 6.5ms)


Started DELETE "/signout" for 127.0.0.1 at 2014-09-11 23:35:52 +0200
Processing by SessionsController#destroy as HTML
  Parameters: {"authenticity_token"=>"EnuvYj+haJBAfNMZM9wHht8J39FEqL0UbNbGvMs7Hrw="}
sign_out
  User Load (0.2ms)  SELECT  "users".* FROM "users"  WHERE "users"."remember_token" = 'adadf53cb92fde2725119922e01837fa1412d73c' LIMIT 1
Completed 500 Internal Server Error in 1ms

NoMethodError (undefined method `update_attribute' for nil:NilClass):
  app/helpers/sessions_helper.rb:12:in `sign_out'
  app/controllers/sessions_controller.rb:17:in `destroy'


  Rendered /Users/Martin/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/_source.erb (1.0ms)
  Rendered /Users/Martin/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (2.0ms)
  Rendered /Users/Martin/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.7ms)
  Rendered /Users/Martin/.rvm/gems/ruby-2.1.2/gems/actionpack-4.1.4/lib/action_dispatch/middleware/templates/rescues/diagnostics.erb within rescues/layout (20.7ms)

Secondly, navigation list is incorrect. When user is logged in, some of the static_pages lists correctly, while others omit admin link and log out link.

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