I was connecting directly to my server to try to debug something. I disabled the ensure_application_is_installed_by_facebook_user check, then tried to connect to my index action. Got this error: SystemStackError in FacebookController#index stack level too deep RAILS_ROOT: script/../config/.. Application Trace | Framework Trace | Full Trace vendor/rails/activesupport/lib/active_support/core_ext/hash/indifferent_access.rb:18:in `default'' vendor/plugins/facebooker/lib/facebooker/rails/controller.rb:119:in `[]'' vendor/plugins/facebooker/lib/facebooker/rails/controller.rb:119:in `request_is_for_a_facebook_canvas?'' vendor/plugins/facebooker/lib/facebooker/rails/controller.rb:107:in `redirect_to'' vendor/rails/actionpack/lib/action_controller/base.rb:987:in `redirect_to'' vendor/plugins/facebooker/lib/facebooker/rails/controller.rb:110:in `redirect_to'' vendor/rails/actionpack/lib/action_controller/base.rb:987:in `redirect_to'' vendor/plugins/facebooker/lib/facebooker/rails/controller.rb:110:in `redirect_to'' vendor/rails/actionpack/lib/action_controller/base.rb:987:in `redirect_to'' vendor/plugins/facebooker/lib/facebooker/rails/controller.rb:110:in `redirect_to'' ### ... above two lines repeated 100''s of times ... ### app/controllers/pages_controller.rb:11:in `method_missing'' Request Parameters: None Show session dump --- flash: !map:ActionController::Flash::FlashHash {} Response Headers: {"cookie"=>[], "Cache-Control"=>"no-cache"}