diff --git a/lib/locomotive/steam/models/mapper.rb b/lib/locomotive/steam/models/mapper.rb
index f05575b7..9ba427ab 100644
--- a/lib/locomotive/steam/models/mapper.rb
+++ b/lib/locomotive/steam/models/mapper.rb
@@ -78,7 +78,8 @@ def serialize(entity)
           # localized fields
           @localized_attributes.each do |name|
             # hack: force the name for select type fields (content entries only)
-            entity.send(name).serialize(attributes, name) 
+            value = entity.send(name)
+            value.serialize(attributes, name) if value.respond_to?(:serialize)
           end
 
           # association name -> id (belongs_to) or ids (many_to_many)
diff --git a/spec/unit/models/mapper_spec.rb b/spec/unit/models/mapper_spec.rb
index 64c1a850..5f1d2448 100644
--- a/spec/unit/models/mapper_spec.rb
+++ b/spec/unit/models/mapper_spec.rb
@@ -79,6 +79,11 @@
 
     end
 
+    describe 'localized attributes' do
+      let(:block) { ->(_) { localized_attributes(:title) } }
+      let(:attributes) { { title: { fr: 'Bonjour' }, body: 'Lorem ipsum', published_at: DateTime.parse('2007/06/29 00:00:00') } }
+      it { expect(subject).to eq('title' => { 'fr' => 'Bonjour' }, 'body' => 'Lorem ipsum', 'published_at' => DateTime.parse('2007/06/29 00:00:00')) }
+    end
   end
 
   describe '#to_entity' do