diff --git a/app/models/site.rb b/app/models/site.rb
index c54ea19a..c11a2e60 100644
--- a/app/models/site.rb
+++ b/app/models/site.rb
@@ -584,7 +584,7 @@ class Site < ApplicationRecord
   #
   # @return [Bool]
   def theme?
-    config.key?('theme')
+    config['theme'].present?
   end
 
   # El directorio donde se encuentran los archivos de la plantilla. Si