On some projects I get just a 500 error with following debug output:

Completed 500 Internal Server Error in 145ms

ActionView::Template::Error (comparison of Array with Array failed):
    20: 
    21: 
    22: <%= label_tag('add_filter_select', l(:label_filter_add)) %>
    23: <%= select_tag 'add_filter_select', filters_options_for_select(query), :name => nil %>
    24: 
    25: 
    26: 
  app/helpers/queries_helper.rb:27:in `sort'
  app/helpers/queries_helper.rb:27:in `filters_options'
  app/helpers/queries_helper.rb:22:in `filters_options_for_select'
  app/views/queries/_filters.html.erb:23:in `_app_views_queries__filters_html_erb__1987712775818747131_9018920'
  app/views/issues/index.html.erb:18:in `block in _app_views_issues_index_html_erb___3250084186343222987_10921720'
  app/views/issues/index.html.erb:11:in `_app_views_issues_index_html_erb___3250084186343222987_10921720'
  app/controllers/issues_controller.rb:83:in `block (2 levels) in index'
  app/controllers/issues_controller.rb:82:in `index'

In development environment I tried to empty the queries table, does not help. The hint from "boards about this":http://www.redmine.org/boards/2/topics/35358 did not help for me.

So I did a workaround changing @app/helpers/queries_helper.rb@ and replaced line 27 with @sorted_options = query.available_filters do |a, b|@

I have no idea whats going wrong, it does not happen on all projects and does not depend on any queries stored. I'd upgraded from redmine 1.4.x to 2.2.2, all other stuff is working.