diff --git a/tpl/macro.twig b/tpl/macro.twig
index 161daa1..6abfe5f 100644
--- a/tpl/macro.twig
+++ b/tpl/macro.twig
@@ -258,7 +258,7 @@ class {{o.name}}
 
   {{ _self.enum_values(o) }}
 
-  const DEFAULT_VALUE = {{o.values | first}};
+  const DEFAULT_VALUE = {{o.values|length > 0 ? o.values | first : 0}};
 
   function getClassId()
   {