course/participants: fix sort order when last access is null

diff --git a/user/index.php b/user/index.php
index 944560af54f4794b4a1795ae062ec8471dd4b151..c2104ab6faa215e793c46514d3c307e1c1e5026b 100644 (file)
--- a/user/index.php
+++ b/user/index.php
@@ -321,7 +321,7 @@
     } else {
         $selectrole = " ";
     }
-    $select = 'SELECT u.id, u.username, u.firstname, u.lastname, u.email, u.city, u.country, u.picture, u.lang, u.timezone, u.emailstop, u.maildisplay, ul.timeaccess AS lastaccess, r.hidden '; // s.lastaccess
+    $select = 'SELECT u.id, u.username, u.firstname, u.lastname, u.email, u.city, u.country, u.picture, u.lang, u.timezone, u.emailstop, u.maildisplay, COALESCE(ul.timeaccess, 0) AS lastaccess, r.hidden '; // s.lastaccess
     $select .= $course->enrolperiod?', r.timeend ':'';
 
     $from   = "FROM {$CFG->prefix}user u INNER JOIN