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-rw-r--r--activerecord/lib/active_record/persistence.rb2
1 files changed, 1 insertions, 1 deletions
diff --git a/activerecord/lib/active_record/persistence.rb b/activerecord/lib/active_record/persistence.rb
index 309bb980e3..b94ef18fd5 100644
--- a/activerecord/lib/active_record/persistence.rb
+++ b/activerecord/lib/active_record/persistence.rb
@@ -181,7 +181,7 @@ module ActiveRecord
became = klass.new
became.instance_variable_set("@attributes", @attributes)
became.instance_variable_set("@attributes_cache", @attributes_cache)
- became.instance_variable_set("@changed_attributes", @changed_attributes)
+ became.instance_variable_set("@changed_attributes", @changed_attributes) if defined?(@changed_attributes)
became.instance_variable_set("@new_record", new_record?)
became.instance_variable_set("@destroyed", destroyed?)
became.instance_variable_set("@errors", errors)