Redmine

Could you paste the error log in log/production.log file?

sorry for delay, took me longer than I expected to find it ;-). version/146 = one of the versions with Wiki Page specified:

Started GET "/versions/146" for 82.117.133.194 at 2017-01-26 21:12:35 +0100
Processing by VersionsController#show as HTML
  Parameters: {"id"=>"146"}
  Current user: pkveton (id=53)
  Rendered plugins/advanced_roadmap/app/views/versions/show.html.erb within layouts/base (2.5ms)
Completed 500 Internal Server Error in 540ms (ActiveRecord: 49.3ms)

ActionView::Template::Error (No route matches {:action=>"edit", :controller=>"wiki", :id=>#<Project id: 1, name: "Qorus", description: "", homepage: "", is_public: false, parent_id: nil, created_on: "2013-06-10 11:27:52", updated_on: "2013-06-10 13:19:24", identifier: "qorus", status: 1, lft: 9, rgt: 18, inherit_members: false, default_version_id: nil>, :page=>"Qorus_version_310"}):
    1: <div class="contextual">
    2:   <%= link_to_if_authorized l(:button_edit), {:controller => 'versions', :action => 'edit', :id => @version}, :class => 'icon icon-edit' %>
    3:   <%= link_to_if_authorized(l(:button_edit_associated_wikipage, :page_title => @version.wiki_page_title), {:controller => 'wiki', :action => 'edit', :id => @version.project, :page => Wiki.titleize(@version.wiki_page_title)}, :class => 'icon icon-edit') unless @version.wiki_page_title.blank? || @version.project.wiki.nil? %>
    4:   <%= call_hook(:view_versions_show_contextual, { :version => @version, :project => @project }) %>
    5: </div>
    6: 
  app/helpers/application_helper.rb:48:in `link_to_if_authorized'
  plugins/advanced_roadmap/app/views/versions/show.html.erb:3:in `_plugins_advanced_roadmap_app_views_versions_show_html_erb___4035772425503105859_110654900'
  lib/redmine/sudo_mode.rb:63:in `sudo_mode'

I hope this helps - if you need more info, pls let me know...