From ac3e5d26695a7f466316d49162cd8fd187e26ede Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20B=C3=B6hmer?= <jan.h.boehmer@gmx.de>
Date: Sun, 6 Oct 2019 15:49:42 +0200
Subject: [PATCH] Fixed exception when try to create a new part.

---
 .../EntityListeners/ElementPermissionListener.php         | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/src/Security/EntityListeners/ElementPermissionListener.php b/src/Security/EntityListeners/ElementPermissionListener.php
index 9a1e7059..248909b7 100644
--- a/src/Security/EntityListeners/ElementPermissionListener.php
+++ b/src/Security/EntityListeners/ElementPermissionListener.php
@@ -134,10 +134,12 @@ class ElementPermissionListener
 
                 //If the user is not allowed to edit or read this property, reset all values.
                 if ((!$this->security->isGranted($annotation->getEditOperationName(), $element)
-                        || !$this->security->isGranted($annotation->getReadOperationName(), $element))) {
+                    || !$this->security->isGranted($annotation->getReadOperationName(), $element))) {
                     //Set value to old value, so that there a no change to this property
-                    $property->setValue($element, $old_data[$property->getName()]);
-                    $changed = true;
+                    if (isset($old_data[$property->getName()])) {
+                        $property->setValue($element, $old_data[$property->getName()]);
+                        $changed = true;
+                    }
 
                 }