diff --git a/app/views/posts/modal.haml b/app/views/posts/modal.haml
index 6875cea8..e589dfa8 100644
--- a/app/views/posts/modal.haml
+++ b/app/views/posts/modal.haml
@@ -59,7 +59,8 @@
         = render 'posts/attributes', site: site, post: post, dir: dir, base: base, locale: locale, except: except
         -# @todo Volver obligatorios?
         - except.each do |attr|
-          %input{ type: 'hidden', name: "#{base}[#{attr}]", value: pluck_param(attr, optional: true) }
+          - if (value = pluck_param(attr, optional: true))
+            = hidden_field_tag "#{base}[#{attr}]", value
 
     - content_for :"#{modal_id}_footer" do
       -# = render 'posts/validation', site: site, invalid: { id: invalid_id }, submitting: { id: submitting_id }