diff --git a/core/groups/resources/classes/permission.php b/core/groups/resources/classes/permission.php
index ea8afc4026..ae8d49d4b2 100644
--- a/core/groups/resources/classes/permission.php
+++ b/core/groups/resources/classes/permission.php
@@ -138,6 +138,8 @@
 								if ($permission['groups']) {
 									foreach ($permission['groups'] as $group_name) {
 										//check group protection
+										$group_uuid = null;
+										$group_protected = null;
 										if (is_array($groups)) {
 											foreach ($groups as $group) {
 												if ($group['group_name'] == $group_name) {