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First Thank you for the plugin, you have done a great job.
I receive the following error with some of the users. it happens because they create an issue that is not related to a task - which sometimes is required in my project.

Processing AdvancedReportController#index (for 192.168.1.50 at 2010-09-20 14:06:11) [POST]
  Parameters: {"selected_projects"=>["2"], "period"=>"all", "from"=>"2010-08-04", "selected_members"=>["14"], "action"=>"index", "authenticity_token"=>"GEDeMIORcozhZjwAT2hEu3Fvnee5Mk8JzBcDh95fJw8=", "to"=>"2010-09-19", "period_type"=>"1", "controller"=>"advanced_report"}
retrieve_date_range()

NoMethodError (undefined method `subject' for nil:NilClass):
  vendor/plugins/advanced_report/app/controllers/advanced_report_controller.rb:97:in `index'
  vendor/plugins/advanced_report/app/controllers/advanced_report_controller.rb:97:in `sort'
  vendor/plugins/advanced_report/app/controllers/advanced_report_controller.rb:97:in `index'
  vendor/plugins/advanced_report/app/controllers/advanced_report_controller.rb:43:in `each'
  vendor/plugins/advanced_report/app/controllers/advanced_report_controller.rb:43:in `index'
  /usr/lib/ruby/1.8/mongrel/rails.rb:76:in `process'
  /usr/lib/ruby/1.8/mongrel/rails.rb:74:in `synchronize'
  /usr/lib/ruby/1.8/mongrel/rails.rb:74:in `process'
  /usr/lib/ruby/1.8/mongrel.rb:159:in `process_client'
  /usr/lib/ruby/1.8/mongrel.rb:158:in `each'
  /usr/lib/ruby/1.8/mongrel.rb:158:in `process_client'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `run'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `initialize'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `new'
  /usr/lib/ruby/1.8/mongrel.rb:285:in `run'
  /usr/lib/ruby/1.8/mongrel.rb:268:in `initialize'
  /usr/lib/ruby/1.8/mongrel.rb:268:in `new'
  /usr/lib/ruby/1.8/mongrel.rb:268:in `run'
  /usr/lib/ruby/1.8/mongrel/configurator.rb:282:in `run'
  /usr/lib/ruby/1.8/mongrel/configurator.rb:281:in `each'
  /usr/lib/ruby/1.8/mongrel/configurator.rb:281:in `run'
  /usr/lib/ruby/1.8/mongrel/command.rb:212:in `run'

Rendering /opt/redmine/public/500.html (500 Internal Server Error)