1 files changed, 3 insertions, 3 deletions
diff --git a/activerecord/lib/active_record/type/internal/abstract_json.rb b/activerecord/lib/active_record/type/internal/abstract_json.rb
index 097d1bd363..e19c5a14da 100644
--- a/activerecord/lib/active_record/type/internal/abstract_json.rb
+++ b/activerecord/lib/active_record/type/internal/abstract_json.rb
@@ -17,10 +17,10 @@ module ActiveRecord
         end
 
         def serialize(value)
-          if value.is_a?(::Array) || value.is_a?(::Hash)
-            ::ActiveSupport::JSON.encode(value)
+          if value.nil?
+            nil
           else
-            value
+            ::ActiveSupport::JSON.encode(value)
           end
         end