diff --git a/DataStorage/Database/DataMapperAbstract.php b/DataStorage/Database/DataMapperAbstract.php
index 7afeadf4b..a70b74226 100644
--- a/DataStorage/Database/DataMapperAbstract.php
+++ b/DataStorage/Database/DataMapperAbstract.php
@@ -1364,6 +1364,10 @@ class DataMapperAbstract implements DataMapperInterface
     {
         self::extend(__CLASS__);
 
+        if (is_scalar($obj)) {
+            $obj = static::get($obj);
+        }
+
         $reflectionClass = new \ReflectionClass($obj);
         $objId           = self::getObjectId($obj, $reflectionClass);