Merge pull request #1647 from kbond/2.4-php7-nested-set-fix

PHP 7 nested set fix for 2.4

Author: l3pp4rd

lib/Gedmo/Tree/Strategy/ORM/Nested.php

@@ -533,6 +533,13 @@ public function shiftRL(EntityManager $em, $class, $first, $delta, $root = null)
                 if ($node instanceof Proxy && !$node->__isInitialized__) {
                     continue;
                 }
+
+                $nodeMeta = $em->getClassMetadata(get_class($node));
+
+                if (!array_key_exists($config['left'], $nodeMeta->getReflectionProperties())) {
+                    continue;
+                }
+
                 $oid = spl_object_hash($node);
                 $left = $meta->getReflectionProperty($config['left'])->getValue($node);
                 $currentRoot = isset($config['root']) ? $meta->getReflectionProperty($config['root'])->getValue($node) : null;
@@ -599,6 +606,13 @@ public function shiftRangeRL(EntityManager $em, $class, $first, $last, $delta, $
                 if ($node instanceof Proxy && !$node->__isInitialized__) {
                     continue;
                 }
+
+                $nodeMeta = $em->getClassMetadata(get_class($node));
+
+                if (!array_key_exists($config['left'], $nodeMeta->getReflectionProperties())) {
+                    continue;
+                }
+
                 $left = $meta->getReflectionProperty($config['left'])->getValue($node);
                 $right = $meta->getReflectionProperty($config['right'])->getValue($node);
                 $currentRoot = isset($config['root']) ? $meta->getReflectionProperty($config['root'])->getValue($node) : null;