chef client output:
[Wed, 01 Feb 2012 05:55:15 +0000] INFO: Missing gem 'mysql'
[Wed, 01 Feb 2012 05:55:16 +0000] ERROR: Running exception handlers
[Wed, 01 Feb 2012 05:55:16 +0000] FATAL: Saving node information to /var/chef/cache/failed-run-data.json
[Wed, 01 Feb 2012 05:55:16 +0000] ERROR: Exception handlers complete
[Wed, 01 Feb 2012 05:55:16 +0000] FATAL: Stacktrace dumped to /var/chef/cache/chef-stacktrace.out
[Wed, 01 Feb 2012 05:55:16 +0000] FATAL: NoMethodError: undefined method `[]' for nil:NilClass

stacktrace.out:
NoMethodError: undefined method `[]' for nil:NilClass
/var/chef/cache/cookbooks/application/recipes/passenger_apache2.rb:27:in `from_file'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/cookbook_version.rb:578:in `load_recipe'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/mixin/language_include_recipe.rb:40:in `include_recipe'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/mixin/language_include_recipe.rb:27:in `each'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/mixin/language_include_recipe.rb:27:in `include_recipe'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/run_context.rb:72:in `load'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/run_context.rb:69:in `each'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/run_context.rb:69:in `load'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/client.rb:195:in `setup_run_context'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/client.rb:159:in `run'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/application/client.rb:239:in `run_application'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/application/client.rb:229:in `loop'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/application/client.rb:229:in `run_application'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/../lib/chef/application.rb:67:in `run'
/usr/lib/ruby/gems/1.8/gems/chef-0.10.4/bin/chef-client:26
/usr/bin/chef-client:19:in `load'
/usr/bin/chef-client:19


/var/chef/cache/cookbooks/application/recipes/passenger_apache2.rb:27:in `from_file':
server_aliases = [ "#{app['id']}.#{node['domain']}", node['fqdn'] ]

app['id'] is set in my databag, it works everywhere else.