diff --git a/application/models/data/Doi.php b/application/models/data/Doi.php
index 61396feb..16e62ede 100644
--- a/application/models/data/Doi.php
+++ b/application/models/data/Doi.php
@@ -141,8 +141,8 @@ class Doi extends Zend_Controller_Plugin_Abstract
 		//$orgs = "{".join(",",$orgs)."}";
 		$authors_en = "{".join(",",$authors_en)."}";
 		$orgs_en = "{".join(",",$orgs_en)."}";
-		$data['authors'] = null;
-		$data['organization'] = null;
+		$data['authors'] = '{}';
+		$data['organization'] = '{}';
 		$data['author_en'] = $authors_en;
 		$data['organization_en'] = $orgs_en;
 		unset($data['info']);