diff --git a/src/Entity/User.php b/src/Entity/User.php
index 1706fd0..74844f6 100644
--- a/src/Entity/User.php
+++ b/src/Entity/User.php
@@ -52,7 +52,12 @@ public function getId()
      */
     public function setId($id)
     {
-        $this->id = (int) $id;
+        if (is_null($id)) {
+            $this->id = $id;
+        }
+        else {
+            $this->id = (int)$id;
+        }
         return $this;
     }