1 files changed, 6 insertions, 2 deletions
diff --git a/activerecord/lib/active_record/associations/preloader/has_many_through.rb b/activerecord/lib/active_record/associations/preloader/has_many_through.rb
index 38bc7ce7da..157b627ad5 100644
--- a/activerecord/lib/active_record/associations/preloader/has_many_through.rb
+++ b/activerecord/lib/active_record/associations/preloader/has_many_through.rb
@@ -5,9 +5,13 @@ module ActiveRecord
         include ThroughAssociation
 
         def associated_records_by_owner
-          super.each do |owner, records|
-            records.uniq! if reflection_scope.distinct_value
+          records_by_owner = super
+
+          if reflection_scope.distinct_value
+            records_by_owner.each_value { |records| records.uniq! }
           end
+
+          records_by_owner
         end
       end
     end