Redmine

I run a small Redmine setup and after a recent update of the Subversion trunk I can not get the issue list to show, instead I get a 500 error (see below for log). As far as I can tell right now it is only the issues that are dead.
I haven't got too much RnR experience but I'll answer any follow ups if any. Try to help me along with what commands to use.

The site is accessible via the net at http://redmine.sis.bthstudent.se but there are no interesting output at the error page.

Processing IssuesController#index (for 90.224.34.234 at 2010-04-02 01:37:23) [GET]
  Parameters: {"project_id"=>"drift", "action"=>"index", "controller"=>"issues"}
Rendering template within layouts/base
Rendering issues/index.rhtml

ActionView::TemplateError (undefined method `-' for nil:NilClass) on line #16 of app/views/issues/_list.rhtml:
13:     </tr></thead>
14:     <% previous_group = false %>
15:     <tbody>
16:     <% issue_list(issues) do |issue, level| -%>
17:   <% if @query.grouped? && (group = @query.group_by_column.value(issue)) != previous_group %>
18:     <% reset_cycle %>
19:     <tr class="group open">

    app/helpers/issues_helper.rb:28:in `issue_list'
    app/helpers/issues_helper.rb:23:in `each'
    app/helpers/issues_helper.rb:23:in `issue_list'
    app/views/issues/_list.rhtml:16
    app/views/issues/_list.rhtml:1:in `_run_rhtml_app47views47issues47_list46rhtml_locals_issues_list_object_query'
    app/views/issues/index.rhtml:62:in `_run_rhtml_app47views47issues47index46rhtml'
    app/controllers/issues_controller.rb:80
    app/controllers/issues_controller.rb:79:in `index'
    /usr/lib/ruby/1.8/phusion_passenger/rack/request_handler.rb:92:in `process_request'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_request_handler.rb:207:in `main_loop'
    /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:400:in `start_request_handler'
    /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:351:in `handle_spawn_application'
    /usr/lib/ruby/1.8/phusion_passenger/utils.rb:184:in `safe_fork'
    /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:349:in `handle_spawn_application'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:352:in `__send__'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:352:in `main_loop'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:196:in `start_synchronously'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:163:in `start'
    /usr/lib/ruby/1.8/phusion_passenger/railz/application_spawner.rb:209:in `start'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:262:in `spawn_rails_application'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server_collection.rb:126:in `lookup_or_add'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:256:in `spawn_rails_application'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server_collection.rb:80:in `synchronize'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server_collection.rb:79:in `synchronize'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:255:in `spawn_rails_application'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:154:in `spawn_application'
    /usr/lib/ruby/1.8/phusion_passenger/spawn_manager.rb:287:in `handle_spawn_application'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:352:in `__send__'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:352:in `main_loop'
    /usr/lib/ruby/1.8/phusion_passenger/abstract_server.rb:196:in `start_synchronously'
    /usr/lib/phusion_passenger/passenger-spawn-server:61

Rendering /var/lib/sis/redmine/public/500.html (500 Internal Server Error)

I run this on Debian with Apache and mod_pasenger, here is my other data.

About your application's environment
Ruby version              1.8.7 (i486-linux)
RubyGems version          1.3.5
Rack version              1.0
Rails version             2.3.5
Active Record version     2.3.5
Active Resource version   2.3.5
Action Mailer version     2.3.5
Active Support version    2.3.5
Application root          /var/lib/sis/redmine
Environment               production
Database adapter          mysql
Database schema version   20091220184736

About your Redmine plugins
Redmine Repo Pygments plugin   0.0.2

About the SVN co if that would matter.

brigham:/var/lib/sis/redmine# svn info
Path: .
URL: svn://rubyforge.org/var/svn/redmine/trunk
Repository Root: svn://rubyforge.org/var/svn/redmine
Repository UUID: e93f8b46-1217-0410-a6f0-8f06a7374b81
Revision: 3625
Node Kind: directory
Schedule: normal
Last Changed Author: jplang
Last Changed Rev: 3625
Last Changed Date: 2010-03-29 21:50:00 +0200 (Mon, 29 Mar 2010)