Error showing project name

[gastonambrogi]

When I want to show a project inside the Redmine app it crashes and the log is this:

2016-04-18T12:17:49.193596+00:00 app[web.1]: ActionView::Template::Error (undefined methodname' for nil:NilClass):
2016-04-18T12:17:49.193596+00:00 app[web.1]: 42: <% end %>
2016-04-18T12:17:49.193597+00:00 app[web.1]: 43:
2016-04-18T12:17:49.193597+00:00 app[web.1]: 44:

<%= page_header_title %>

2016-04-18T12:17:49.193598+00:00 app[web.1]: 45:
2016-04-18T12:17:49.193598+00:00 app[web.1]: 46: <% if display_main_menu?(@project) %>
2016-04-18T12:17:49.193599+00:00 app[web.1]: 47:

2016-04-18T12:17:49.193599+00:00 app[web.1]: 48: <%= render_main_menu(@project) %>
2016-04-18T12:17:49.193600+00:00 app[web.1]: lib/redmine.rb:246:in block (2 levels) in <top (required)>' 2016-04-18T12:17:49.193600+00:00 app[web.1]: lib/redmine/menu_manager.rb:199:incall'
2016-04-18T12:17:49.193601+00:00 app[web.1]: lib/redmine/menu_manager.rb:199:in allowed_node?' 2016-04-18T12:17:49.193601+00:00 app[web.1]: lib/redmine/menu_manager.rb:166:inblock in menu_items_for'
2016-04-18T12:17:49.193601+00:00 app[web.1]: lib/redmine/menu_manager.rb:165:in each' 2016-04-18T12:17:49.193602+00:00 app[web.1]: lib/redmine/menu_manager.rb:165:inmenu_items_for'
2016-04-18T12:17:49.193602+00:00 app[web.1]: lib/redmine/menu_manager.rb:90:in render_menu' 2016-04-18T12:17:49.193603+00:00 app[web.1]: lib/redmine/menu_manager.rb:80:inrender_main_menu'
2016-04-18T12:17:49.193603+00:00 app[web.1]: app/views/layouts/base.html.erb:45:in _app_views_layouts_base_html_erb__3721992491593176369_70148833958020' 2016-04-18T12:17:49.193604+00:00 app[web.1]: app/controllers/projects_controller.rb:163:inshow'
`