diff --git a/remote_permissions/remote_permissions.php b/remote_permissions/remote_permissions.php
index ad6d7b25..6c25df27 100644
--- a/remote_permissions/remote_permissions.php
+++ b/remote_permissions/remote_permissions.php
@@ -128,10 +128,10 @@ function remote_permissions_content($a, $item_copy) {
 			/** @var ACLFormatter $aclFormatter */
 			$aclFormatter = BaseObject::getClass(ACLFormatter::class);
 
-			$allowed_users = $aclFormatter->expand($item['allow_cid']);
-			$allowed_groups = $aclFormatter->expand($item['allow_gid']);
-			$deny_users = $aclFormatter->expand($item['deny_cid']);
-			$deny_groups = $aclFormatter->expand($item['deny_gid']);
+			$allowed_users = $aclFormatter->expand($item['allow_cid'] ?? '');
+			$allowed_groups = $aclFormatter->expand($item['allow_gid'] ?? '');
+			$deny_users = $aclFormatter->expand($item['deny_cid'] ?? '');
+			$deny_groups = $aclFormatter->expand($item['deny_gid'] ?? '');
 
 			$o = L10n::t('Visible to:') . '<br />';
 			$allow = [];