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-rw-r--r--activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
index 027d736484..abb695264e 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract/database_statements.rb
@@ -113,7 +113,7 @@ module ActiveRecord
def transaction(options = {})
options.assert_valid_keys :requires_new, :joinable
- last_transaction_joinable = @transaction_joinable
+ last_transaction_joinable = defined?(@transaction_joinable) ? @transaction_joinable : nil
if options.has_key?(:joinable)
@transaction_joinable = options[:joinable]
else