From 4aaf8c65e60551d3c4ab81cf6f8331a522a2ed0c Mon Sep 17 00:00:00 2001
From: Julio Montoya <gugli100@gmail.com>
Date: Tue, 11 May 2021 10:16:32 +0200
Subject: [PATCH] Fix student publication order BT#18771

---
 main/inc/ajax/model.ajax.php | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/main/inc/ajax/model.ajax.php b/main/inc/ajax/model.ajax.php
index 455a6d981b..961b8f252b 100755
--- a/main/inc/ajax/model.ajax.php
+++ b/main/inc/ajax/model.ajax.php
@@ -1440,8 +1440,8 @@ switch ($action) {
         }
 
         $whereCondition = " AND $whereCondition ";
-
-        $sidx = in_array($sidx, $columns) ? $sidx : 'title';
+        $columnOrderValidList = array_merge(['firstname', 'lastname'], $columns);
+        $sidx = in_array($sidx, $columnOrderValidList) ? $sidx : 'title';
 
         $result = get_work_user_list(
             $start,