Redmine › SCM Creator (+Github)

After working around #2193, I get this error when clicking the “Create new repository” button (next to the new repository URL):

Processing RepositoriesController#create (for ... at 2013-07-16 13:06:02) [POST]
  Parameters: {"authenticity_token"=>"...", "repository_scm"=>"Bazaar", "repository"=>{"is_default"=>"0", "identifier"=>"linux", "url"=>"/home/code/bzr/project.linux", "log_encoding"=>"UTF-8", "checkout_overwrite"=>"0", "checkout_description"=>"The data contained in this repository can be downloaded to your computer using one of several clients.\r\nPlease see the documentation of your version control software client for more information.\r\n\r\nPlease select the desired protocol below to get the URL.\r\n", "checkout_display_command"=>"1", "checkout_protocols"=>{"-1"=>{"protocol"=>"empty"}, "0"=>{"protocol"=>"Bazaar", "command"=>"bzr checkout", "fixed_url"=>"", "access"=>"permission", "is_default"=>"1"}}}, "commit"=>"Create new repository", "operation"=>"add", "controller"=>"repositories", "action"=>"create", "project_id"=>"project"}

NoMethodError (undefined method `safe_attribute_names' for #<Repository::Bazaar:0x0000000387e670>):
  /usr/lib/ruby/vendor_ruby/active_record/attribute_methods.rb:275:in `method_missing'
  /usr/lib/ruby/vendor_ruby/action_controller/base.rb:1333:in `perform_action'
  /usr/lib/ruby/vendor_ruby/action_controller/filters.rb:617:in `call_filters'
  /usr/lib/ruby/vendor_ruby/action_controller/filters.rb:610:in `perform_action_with_filters'
  /usr/lib/ruby/vendor_ruby/action_controller/benchmarking.rb:68:in `block in perform_action_with_benchmark'
  /usr/lib/ruby/vendor_ruby/action_controller/benchmarking.rb:68:in `perform_action_with_benchmark'
  /usr/lib/ruby/vendor_ruby/action_controller/rescue.rb:160:in `perform_action_with_rescue'
  /usr/lib/ruby/vendor_ruby/action_controller/flash.rb:151:in `perform_action_with_flash'
  /usr/lib/ruby/vendor_ruby/action_controller/base.rb:532:in `process'
  /usr/lib/ruby/vendor_ruby/action_controller/filters.rb:606:in `process_with_filters'
  /usr/lib/ruby/vendor_ruby/action_controller/base.rb:391:in `process'
  /usr/lib/ruby/vendor_ruby/action_controller/base.rb:386:in `call'
  /usr/lib/ruby/vendor_ruby/action_controller/routing/route_set.rb:438:in `call'
  /usr/lib/ruby/vendor_ruby/action_controller/dispatcher.rb:87:in `dispatch'
  /usr/lib/ruby/vendor_ruby/action_controller/dispatcher.rb:121:in `_call'
  /usr/lib/ruby/vendor_ruby/action_controller/dispatcher.rb:130:in `block in build_middleware_stack'
  /usr/lib/ruby/vendor_ruby/active_record/query_cache.rb:29:in `call'
  /usr/lib/ruby/vendor_ruby/active_record/query_cache.rb:29:in `block in call'
  /usr/lib/ruby/vendor_ruby/active_record/connection_adapters/abstract/query_cache.rb:34:in `cache'
  /usr/lib/ruby/vendor_ruby/active_record/query_cache.rb:9:in `cache'
  /usr/lib/ruby/vendor_ruby/active_record/query_cache.rb:28:in `call'
  /usr/lib/ruby/vendor_ruby/active_record/connection_adapters/abstract/connection_pool.rb:361:in `call'
  /usr/lib/ruby/vendor_ruby/action_controller/string_coercion.rb:25:in `call'
  /usr/lib/ruby/vendor_ruby/rack/head.rb:9:in `call'
  /usr/lib/ruby/vendor_ruby/rack/methodoverride.rb:21:in `call'
  /usr/lib/ruby/vendor_ruby/action_controller/params_parser.rb:15:in `call'
  /usr/lib/ruby/vendor_ruby/action_controller/session/cookie_store.rb:99:in `call'
  /usr/lib/ruby/vendor_ruby/action_controller/failsafe.rb:26:in `call'
  /usr/lib/ruby/vendor_ruby/rack/lock.rb:15:in `call'
  /usr/lib/ruby/vendor_ruby/action_controller/dispatcher.rb:106:in `call'
  /usr/lib/ruby/vendor_ruby/rack/handler/fastcgi.rb:66:in `serve'
  public/dispatch.fcgi:24:in `<main>'

Rendering /usr/share/redmine/public/500.html (500 Internal Server Error)

Again redmine 1.4.4 in debian stable.