From abf20833e475151d730cad728a0e1160ee510f07 Mon Sep 17 00:00:00 2001
From: Beatrycze Volk <beatrycze.volk@slub-dresden.de>
Date: Mon, 3 Jul 2023 17:42:31 +0200
Subject: [PATCH] Update sorting to use year when orderlabel is empty

---
 Classes/Controller/TableOfContentsController.php | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/Classes/Controller/TableOfContentsController.php b/Classes/Controller/TableOfContentsController.php
index 21f08e733e..a9b36b95fa 100644
--- a/Classes/Controller/TableOfContentsController.php
+++ b/Classes/Controller/TableOfContentsController.php
@@ -329,7 +329,10 @@ private function sortMenu(&$menu) {
      */
     private function sortSubMenu(&$menu) {
         usort($menu[0]['_SUB_MENU'], function ($firstElement, $secondElement) {
-            return $firstElement['orderlabel'] <=> $secondElement['orderlabel'];
+            if (!empty($firstElement['orderlabel'])) {
+                return $firstElement['orderlabel'] <=> $secondElement['orderlabel'];
+            }
+            return $firstElement['year'] <=> $secondElement['year'];
         });
     }
 }