From 989321fa3d0b843bbeebf7e4eec437fa68459794 Mon Sep 17 00:00:00 2001
From: Neill Magill <neill.magill@nottingham.ac.uk>
Date: Mon, 9 Nov 2015 16:18:04 +0000
Subject: [PATCH] Expired enrolments can prevent student self-attendance

...even when their is another enrolemnt that means they are still active on the course.

This fixes issue #178 and is similar to issue #81
---
 locallib.php | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/locallib.php b/locallib.php
index 34efe76..e106f89 100644
--- a/locallib.php
+++ b/locallib.php
@@ -1042,7 +1042,7 @@ class attendance {
 
         // CONTRIB-4868
         $mintime = 'MIN(CASE WHEN (ue.timestart > :zerotime) THEN ue.timestart ELSE ue.timecreated END)';
-        $maxtime = 'MAX(ue.timeend)';
+        $maxtime = 'CASE WHEN MIN(ue.timeend) = 0 THEN 0 ELSE MAX(ue.timeend) END';
 
         $sql = "SELECT ue.userid, ue.status,
                        $mintime AS mintime,