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500 when save wiki page

Hello! I trying to save a new wiki page for one of my project, but i got 500. Gitlab CE 8.7.0

==> /var/log/gitlab/gitlab-rails/production.log <==
Started POST "/heim_pal/astop.hu/wikis" for 79.172.237.235 at 2016-04-27 11:51:36 +0200
Processing by Projects::WikisController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"[FILTERED]", "wiki"=>{"title"=>"pluginok/letoltheto", "format"=>"markdown", "content"=>"Asdasd", "message"=>"commit msg"}, "namespace_id"=>"heim_pal", "project_id"=>"astop.hu"}
Completed 500 Internal Server Error in 75ms (ActiveRecord: 7.4ms)

NoMethodError (undefined method `username' for #<Group:0x00000006a3e318>):
  app/models/project_wiki.rb:158:in `default_message'
  app/models/project_wiki.rb:152:in `commit_details'
  app/models/project_wiki.rb:91:in `create_page'
  app/models/wiki_page.rb:183:in `save'
  app/models/wiki_page.rb:143:in `create'
  app/services/wiki_pages/create_service.rb:6:in `execute'
  app/controllers/projects/wikis_controller.rb:58:in `create'
  lib/gitlab/middleware/go.rb:16:in `call'

==> /var/log/gitlab/gitlab-workhorse/current <==
2016-04-27_09:51:36.60457 2016/04/27 11:51:36 ErrorPage: serving predefined error page: 500
2016-04-27_09:51:36.60472 gitlab.tabletbizz.com 127.0.0.1:48024 - - [2016-04-27 11:51:36.502523504 +0200 CEST] "POST /heim_pal/astop.hu/wikis HTTP/1.1" 500 2205 "https://gitlab.tabletbizz.com/heim_pal/astop.hu/wikis/pluginok/letoltheto" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36" 0.102137