1 files changed, 1 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/autosave_association.rb b/activerecord/lib/active_record/autosave_association.rb
index 453c6e4c8c..e05b7cd6d2 100644
--- a/activerecord/lib/active_record/autosave_association.rb
+++ b/activerecord/lib/active_record/autosave_association.rb
@@ -491,9 +491,7 @@ module ActiveRecord
       end
 
       def _ensure_no_duplicate_errors
-        errors.messages.each_key do |attribute|
-          errors[attribute].uniq!
-        end
+        errors.uniq!
       end
   end
 end