Valium 0.3.0 empty? backtrace

gistfile1.txt

activerecord (3.0.9) lib/active_record/associations/association_proxy.rb:216:in `method_missing'
valium (0.3.0) lib/valium.rb:96:in `value_of'
activerecord (3.0.9) lib/active_record/autosave_association.rb:337:in `save_has_one_association'
activerecord (3.0.9) lib/active_record/autosave_association.rb:169:in `block in add_autosave_association_callbacks'
activesupport (3.0.9) lib/active_support/callbacks.rb:431:in `_run_save_callbacks'
activerecord (3.0.9) lib/active_record/callbacks.rb:273:in `create_or_update'
activerecord (3.0.9) lib/active_record/persistence.rb:40:in `save'
activerecord (3.0.9) lib/active_record/validations.rb:43:in `save'
activerecord (3.0.9) lib/active_record/attribute_methods/dirty.rb:21:in `save'
activerecord (3.0.9) lib/active_record/transactions.rb:240:in `block (2 levels) in save'
activerecord (3.0.9) lib/active_record/transactions.rb:292:in `block in with_transaction_returning_status'
activerecord (3.0.9) lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction'
activerecord (3.0.9) lib/active_record/transactions.rb:207:in `transaction'
newrelic_rpm (3.1.0) lib/new_relic/agent/method_tracer.rb:392:in `block in transaction_with_trace_ActiveRecord_self_name_transaction'
newrelic_rpm (3.1.0) lib/new_relic/agent/method_tracer.rb:191:in `trace_execution_scoped'
newrelic_rpm (3.1.0) lib/new_relic/agent/method_tracer.rb:387:in `transaction_with_trace_ActiveRecord_self_name_transaction'
activerecord (3.0.9) lib/active_record/transactions.rb:290:in `with_transaction_returning_status'
activerecord (3.0.9) lib/active_record/transactions.rb:240:in `block in save'
activerecord (3.0.9) lib/active_record/transactions.rb:251:in `rollback_active_record_state!'
activerecord (3.0.9) lib/active_record/transactions.rb:239:in `save'
activerecord (3.0.9) lib/active_record/persistence.rb:121:in `update_attribute'
app/controllers/home_controller.rb:25:in `channel'