Redmine

Hi,
I've added a git repository according to this guide:
http://www.redmine.org/projects/redmine/wiki/RedmineRepositories

Instead of

sudo chown rails:rails /var/redmine/git_repositories

I've changed the user to
sudo chown www-data:www-data /var/redmine/git_repositories

When trying to access it, I'll get these errors:

App 20605 stderr: DEPRECATION WARNING: Setting.commit_fix_keywords is deprecated and will be removed in Redmine 3. (called from commit_fix_keywords at /usr/share/redmine/redmine-2.6.0/app/models/setting.rb:198)
App 20605 stderr:
App 20605 stderr: NoMethodError (undefined method `downcase' for nil:NilClass):
App 20605 stderr:   app/models/changeset.rb:100:in `scan_for_issues'
App 20605 stderr:   app/models/repository/git.rb:218:in `save_revision'
App 20605 stderr:   app/models/repository/git.rb:207:in `block (2 levels) in save_revisions'
App 20605 stderr:   app/models/repository/git.rb:204:in `block in save_revisions'
App 20605 stderr:   app/models/repository/git.rb:203:in `each'
App 20605 stderr:   app/models/repository/git.rb:203:in `save_revisions'
App 20605 stderr:   app/models/repository/git.rb:153:in `fetch_changesets'
App 20605 stderr:   app/controllers/repositories_controller.rb:114:in `show'
App 20605 stderr:
App 20605 stderr: