integrity panic

Whatever you do, DON'T PANIC! 
This is what happened:
undefined method `short_identifier' for nil:NilClass 
/home/adva/integrity/views/project.haml:26:in `__tilt_3e1816a3712b9669a3b6a98a55a6f4de'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/dm-core-0.10.2/lib/dm-core/collection.rb:509:in `each'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/extlib-0.9.14/lib/extlib/lazy_array.rb:411:in `each'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/extlib-0.9.14/lib/extlib/lazy_array.rb:411:in `each'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/dm-core-0.10.2/lib/dm-core/collection.rb:506:in `each'
/home/adva/integrity/views/project.haml:22:in `__tilt_3e1816a3712b9669a3b6a98a55a6f4de'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/tilt.rb:192:in `send'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/tilt.rb:192:in `evaluate'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/tilt.rb:449:in `evaluate'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/tilt.rb:131:in `render'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:343:in `render'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:311:in `haml'
./lib/integrity/helpers/rendering.rb:13:in `show'
./lib/integrity/app.rb:82:in `GET /:project'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:863:in `call'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:863:in `route'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `instance_eval'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:521:in `route_eval'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:500:in `route!'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `catch'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:497:in `route!'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `each'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:476:in `route!'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:601:in `dispatch!'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `instance_eval'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `invoke'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `catch'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:566:in `invoke'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:411:in `call!'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:399:in `call'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/haml-2.2.17/lib/sass/plugin/rack.rb:44:in `call'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/rack-1.1.0/lib/rack/methodoverride.rb:24:in `call'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/rack-1.1.0/lib/rack/session/cookie.rb:37:in `call'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:1005:in `synchronize'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/sinatra-1.0/lib/sinatra/base.rb:979:in `call'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/rack/request_handler.rb:92:in `process_request'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/abstract_request_handler.rb:207:in `main_loop'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/rack/application_spawner.rb:118:in `run'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/rack/application_spawner.rb:65:in `spawn_application'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/utils.rb:184:in `safe_fork'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/rack/application_spawner.rb:58:in `spawn_application'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/rack/application_spawner.rb:41:in `spawn_application'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/spawn_manager.rb:159:in `spawn_application'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/spawn_manager.rb:287:in `handle_spawn_application'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/abstract_server.rb:352:in `__send__'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/abstract_server.rb:352:in `main_loop'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/lib/phusion_passenger/abstract_server.rb:196:in `start_synchronously'
/home/adva/.rvm/gems/ruby-1.8.7-p249/gems/passenger-2.2.11/bin/passenger-spawn-server:61