hoptoad notifier crash

gistfile1.txt

[Sun Dec 04 00:27:46 2011] [error] [client 66.249.72.86] Premature end of script headers: who 
[ pid=14792 thr=3074689296 file=ext/apache2/Hooks.cpp:817 time=2011-12-04 00:27:46.536 ]: The backend application (process 15197) did not send a valid HTTP response; instead, it sent nothing at all. It is possible that it has crashed; please check whether there are crashing bugs in this application. 
[ pid=15197 thr=71893150 file=utils.rb:176 time=2011-12-04 00:27:46.613 ]: *** Exception ThreadError in application (thread 0x892013c tried to join itself) (process 15197, thread #<Thread:0x892013c>): 
from /var/www/app/shared/bundle/ruby/1.8/gems/rack-1.3.5/lib/rack/lock.rb:14:in `lock' 
from /var/www/app/shared/bundle/ruby/1.8/gems/rack-1.3.5/lib/rack/lock.rb:14:in `call' 
from /var/www/app/shared/bundle/ruby/1.8/gems/actionpack-3.1.1/lib/action_dispatch/middleware/static.rb:53:in `call' 
from /var/www/app/shared/bundle/ruby/1.8/gems/rack-cache-1.1/lib/rack/cache/context.rb:132:in `forward' 
from /var/www/app/shared/bundle/ruby/1.8/gems/rack-cache-1.1/lib/rack/cache/context.rb:241:in `fetch' 
from /var/www/app/shared/bundle/ruby/1.8/gems/rack-cache-1.1/lib/rack/cache/context.rb:181:in `lookup' 
from /var/www/app/shared/bundle/ruby/1.8/gems/rack-cache-1.1/lib/rack/cache/context.rb:65:in `call!' 
from /var/www/app/shared/bundle/ruby/1.8/gems/rack-cache-1.1/lib/rack/cache/context.rb:50:in `call' 
from /var/www/app/shared/bundle/ruby/1.8/gems/hoptoad_notifier-2.4.11/lib/hoptoad_notifier/user_informer.rb:12:in `call' 
from /var/www/app/shared/bundle/ruby/1.8/gems/railties-3.1.1/lib/rails/engine.rb:456:in `call' 
from /var/www/app/shared/bundle/ruby/1.8/gems/railties-3.1.1/lib/rails/railtie/configurable.rb:30:in `send' 
from /var/www/app/shared/bundle/ruby/1.8/gems/railties-3.1.1/lib/rails/railtie/configurable.rb:30:in `method_missing' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/rack/request_handler.rb:96:in `process_request' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_request_handler.rb:513:in `accept_and_process_next_request' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_request_handler.rb:274:in `main_loop' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/rack/application_spawner.rb:206:in `start_request_handler' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/rack/application_spawner.rb:171:in `send' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/rack/application_spawner.rb:171:in `handle_spawn_application' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/utils.rb:479:in `safe_fork' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/rack/application_spawner.rb:166:in `handle_spawn_application' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_server.rb:357:in `__send__' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_server.rb:180:in `start' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/rack/application_spawner.rb:129:in `start' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/spawn_manager.rb:253:in `spawn_rack_application' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_server_collection.rb:132:in `lookup_or_add' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/spawn_manager.rb:246:in `spawn_rack_application' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_server_collection.rb:82:in `synchronize' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_server_collection.rb:79:in `synchronize' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/spawn_manager.rb:244:in `spawn_rack_application' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/spawn_manager.rb:137:in `spawn_application' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/spawn_manager.rb:275:in `handle_spawn_application' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_server.rb:357:in `__send__' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_server.rb:357:in `server_main_loop' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/lib/phusion_passenger/abstract_server.rb:206:in `start_synchronously' 
from /opt/ruby-enterprise-1.8.7-2010.02/lib/ruby/gems/1.8/gems/passenger-3.0.11/helper-scripts/passenger-spawn-server:99