use relations for template

serviceAddon.php

@@ -20,7 +20,7 @@ function serviceAddon_CreateAccount(array $params) {
         __FUNCTION__,
         $params['model'],
         'debug',
-        $params['model']->productAddon
+        $params['model']->productAddon->name
     );
 
     $emailTemplates = serviceAddonGetEmailTemplatesArray();