From 38e7a9525f22919c654dbc36c56acbe839fe4469 Mon Sep 17 00:00:00 2001
From: "Carlos Alexandre S. da Fonseca" <bozohhot@hotmail.com>
Date: Tue, 21 Nov 2017 10:29:09 -0200
Subject: [PATCH] MDL-24678 mod_chat: Fixed race condition on chat module

---
 mod/chat/lib.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mod/chat/lib.php b/mod/chat/lib.php
index ef91dc1bf6d..f16e8a9743f 100644
--- a/mod/chat/lib.php
+++ b/mod/chat/lib.php
@@ -566,7 +566,7 @@ function chat_get_latest_message($chatid, $groupid=0) {
 
     $sql = "SELECT *
         FROM {chat_messages_current} WHERE chatid = :chatid $groupselect
-        ORDER BY timestamp DESC";
+        ORDER BY timestamp DESC, id DESC";
 
     // Return the lastest one message.
     return $DB->get_record_sql($sql, $params, true);