Redmine

When I define a new custom field type float, and when I try to list issues in a projet used this new custom field, redmine
receive this error :

NoMethodError (undefined method `merge' for nil:NilClass):
/var/www/redmine/app/models/query.rb:181:in `available_filters'
/var/www/redmine/app/models/query.rb:168:in `each'
/var/www/redmine/app/models/query.rb:168:in `available_filters'
/var/www/redmine/app/controllers/issues_controller.rb:240:in `retrieve_query'
/var/www/redmine/app/controllers/issues_controller.rb:46:in `index'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/base.rb:1101:in `send'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/base.rb:1101:in `perform_action_without_filters'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/filters.rb:696:in `call_filters'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/filters.rb:688:in `perform_action_without_benchmark'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/benchmarking.rb:66:in
`perform_action_without_rescue'
/usr/lib/ruby/1.8/benchmark.rb:293:in `measure'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/benchmarking.rb:66:in
`perform_action_without_rescue'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/rescue.rb:83:in `perform_action'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/base.rb:435:in `send'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/base.rb:435:in `process_without_filters'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/filters.rb:684:in
`process_without_session_management_support'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/session_management.rb:114:in `process'
/var/lib/gems/1.8/gems/actionpack-1.13.5/lib/action_controller/base.rb:334:in `process'
/var/lib/gems/1.8/gems/rails-1.2.5/lib/dispatcher.rb:41:in `dispatch'
/var/lib/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:113:in `handle_dispatch'
/var/lib/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:79:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:104:in `service'
/usr/lib/ruby/1.8/webrick/httpserver.rb:65:in `run'
/usr/lib/ruby/1.8/webrick/server.rb:173:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:162:in `start_thread'
/usr/lib/ruby/1.8/webrick/server.rb:95:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `each'
/usr/lib/ruby/1.8/webrick/server.rb:92:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:37:in `start'
/usr/lib/ruby/1.8/webrick/server.rb:82:in `start'
/var/lib/gems/1.8/gems/rails-1.2.5/lib/webrick_server.rb:63:in `dispatch'
/var/lib/gems/1.8/gems/rails-1.2.5/lib/commands/servers/webrick.rb:59
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `require'
/var/lib/gems/1.8/gems/activesupport-1.4.4/lib/active_support/dependencies.rb:495:in `require'
/var/lib/gems/1.8/gems/activesupport-1.4.4/lib/active_support/dependencies.rb:342:in `new_constants_in'
/var/lib/gems/1.8/gems/activesupport-1.4.4/lib/active_support/dependencies.rb:495:in `require'
/var/lib/gems/1.8/gems/rails-1.2.5/lib/commands/server.rb:39
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `gem_original_require'
/usr/lib/ruby/1.8/rubygems/custom_require.rb:27:in `require'
script/server:3