Error accessing admin area

Hello,

when accessing /admin in gitlab, I get a error 500, production.log says following:

Started GET "/admin" for xx.xx.xx.xx at 2015-08-12 16:43:21 +0200
Processing by Admin::DashboardController#index as HTML
Completed 500 Internal Server Error in 250ms (ActiveRecord: 13.2ms)

ActionView::Template::Error (undefined local variable or method `admin_abuse_reports_path' for #<#<Class:0x0000000e649548>:0x0000000dc8acf0>):
    58:         Service Templates
    59: 
    60:   = nav_link(controller: :abuse_reports) do
    61:     = link_to admin_abuse_reports_path, title: "Abuse reports" do
    62:       = icon('exclamation-circle fw')
    63:       %span
    64:         Abuse Reports
  app/views/layouts/nav/_admin.html.haml:61:in `block in _app_views_layouts_nav__admin_html_haml___1500273466076906460_117861020'
  app/helpers/tab_helper.rb:55:in `nav_link'
  app/views/layouts/nav/_admin.html.haml:60:in `_app_views_layouts_nav__admin_html_haml___1500273466076906460_117861020'
  app/views/layouts/_page.html.haml:5:in `_app_views_layouts__page_html_haml__3499157914451267540_118332360'
  app/views/layouts/application.html.haml:13:in `_app_views_layouts_application_html_haml___701782995498695591_117257140'
  app/views/layouts/admin.html.haml:5:in `_app_views_layouts_admin_html_haml___4308353370755571076_120717540'

Does someone have an idea what the problem is?

EDIT:
using gitlab-ce version 7.13.4-ce.0 on Debian testing.

Updated to 7.13.5-ce.0 today, but the problem is still there.