Can't remove kanban in project

[pavo976]

I'm using redmine 2.3.2.stable version.

I can not delete the existing ekanban:

After the confirmation (Are you sure? Yes), in the logs I see the following:

Started DELETE "/projects/6/kanbans/3" for 192.168.1.17 at Thu Sep 19 11:49:32 +0400 2013
Processing by KanbansController#destroy as HTML
  Parameters: {"id"=>"3", "project_id"=>"6", "authenticity_token"=>"En+61ELQ+43CR7F8yhX1EdY6Jy3IFRv8pQBA2XB1/vQ="}
  Current user: pslo (id=8)
Redirected to http://redmine.example.com/projects/6/settings/Kanban
Completed 302 Found in 8ms (ActiveRecord: 0.9ms)
Started GET "/projects/6/settings/Kanban" for 192.168.1.17 at Thu Sep 19 11:49:32 +0400 2013
Processing by ProjectsController#settings as HTML
  Parameters: {"id"=>"6", "tab"=>"Kanban"}
  Current user: pslo (id=8)
  Rendered projects/_form.html.erb (180.8ms)
  Rendered projects/_edit.html.erb (183.7ms)
  Rendered projects/settings/_modules.html.erb (6.8ms)
  Rendered projects/settings/_members.html.erb (188.2ms)
  Rendered projects/settings/_versions.html.erb (5.7ms)
  Rendered projects/settings/_issue_categories.html.erb (11.0ms)
  Rendered projects/settings/_wiki.html.erb (3.1ms)
  Rendered projects/settings/_repositories.html.erb (2.9ms)
  Rendered projects/settings/_boards.html.erb (2.1ms)
  Rendered projects/settings/_activities.html.erb (165.1ms)
  Rendered plugins/ekanban/app/views/kanbans/_setup.html.haml (9.2ms)
  Rendered plugins/ekanban/app/views/common/_tabs.html.erb (588.6ms)
  Rendered projects/settings.html.erb within layouts/base (590.0ms)
  Rendered plugins/redmine_wiki_extensions/app/views/wiki_extensions/_html_header.html.erb (0.1ms)
  Rendered plugins/redmine_wiki_extensions/app/views/wiki_extensions/_body_bottom.html.erb (0.1ms)
Completed 200 OK in 634ms (Views: 598.3ms | ActiveRecord: 22.3ms)

The module switches to 'false', becoming invisible tab kanban. But is it possible to actually remove Kanban? (a delete button for a reason?)

Thanks.