diff --git a/app/lib/active_storage/service/jekyll_service.rb b/app/lib/active_storage/service/jekyll_service.rb
index 92b26e0e..3edd2653 100644
--- a/app/lib/active_storage/service/jekyll_service.rb
+++ b/app/lib/active_storage/service/jekyll_service.rb
@@ -67,7 +67,9 @@ module ActiveStorage
       # @param :key [String]
       # @return [String]
       def filename_for(key)
-        ActiveStorage::Blob.where(key: key).limit(1).pluck(:filename).first
+        ActiveStorage::Blob.where(key: key).limit(1).pluck(:filename).first.tap do |filename|
+          raise ArgumentError, "Filename for key #{key} is blank" if filename.blank?
+        end
       end
 
       # Crea una ruta para la llave con un nombre conocido.