diff --git a/src/Tree/Strategy/ORM/Closure.php b/src/Tree/Strategy/ORM/Closure.php
index bbca73297f..f85578ad48 100644
--- a/src/Tree/Strategy/ORM/Closure.php
+++ b/src/Tree/Strategy/ORM/Closure.php
@@ -278,8 +278,8 @@ public function processPostPersist($em, $entity, AdapterInterface $ea)
             $identifier = $meta->getSingleIdentifierFieldName();
             $nodeId = $meta->getReflectionProperty($identifier)->getValue($node);
 
-            if (is_null($nodeId)) {
-                // Do not update if the node has not been persisted yet
+            if (null === $nodeId) {
+                // Do not update if the node has not been persisted yet.
                 continue;
             }