diff --git a/libraries/classes/Database/Designer/Common.php b/libraries/classes/Database/Designer/Common.php
index 45a9cf403a..70ecaed7f8 100644
--- a/libraries/classes/Database/Designer/Common.php
+++ b/libraries/classes/Database/Designer/Common.php
@@ -265,7 +265,7 @@ class Common
     {
         $cfgRelation = $this->relation->getRelationsParam();
         if (! $cfgRelation['pdfwork']) {
-            return null;
+            return array();
         }
 
         $query = "