diff --git a/Models/DrawImageMapper.php b/Models/DrawImageMapper.php
index 5c41c03..f631f23 100644
--- a/Models/DrawImageMapper.php
+++ b/Models/DrawImageMapper.php
@@ -81,6 +81,11 @@ class DrawImageMapper extends DataMapperAbstract
     {
         try {
             $objId = parent::create($obj, $relations);
+
+            if($objId === null || !is_scalar($objId)) {
+                return $objId;
+            }
+
             $query = new Builder(self::$db);
             $query->prefix(self::$db->getPrefix())
                 ->insert(