diff --git a/unpublished_node_permissions.module b/unpublished_node_permissions.module
index a0db3fd..b65fc24 100644
--- a/unpublished_node_permissions.module
+++ b/unpublished_node_permissions.module
@@ -49,7 +49,7 @@ function unpublished_node_permissions_node_access_records(NodeInterface $node) {
 
     $grants[] = [
       'realm' => 'view_unpublished_author',
-      'gid' => $node->getOwnerId(),
+      'gid' => $node->getOwnerId() ?? 1,
       'grant_view' => 1,
       'grant_update' => 0,
       'grant_delete' => 0,