diff --git a/app/models/metadata_content.rb b/app/models/metadata_content.rb
index 56552fbb..eccdc7af 100644
--- a/app/models/metadata_content.rb
+++ b/app/models/metadata_content.rb
@@ -19,6 +19,7 @@ class MetadataContent < MetadataTemplate
 
   # Detectar si el contenido estaba en Markdown y pasarlo a HTML
   def legacy_content
+    return unless document.content
     return document.content if /^\s*</ =~ document.content
 
     CommonMarker.render_doc(document.content, %i[FOOTNOTES], %i[table strikethrough autolink]).to_html