From 9d0537aa0fd888c7965a16afc59630a7551e1543 Mon Sep 17 00:00:00 2001
From: Dan Marsden <dan@danmarsden.com>
Date: Fri, 2 Jul 2021 19:12:48 +1200
Subject: [PATCH] Improve error checking when a status item was deleted.

---
 lang/en/attendance.php | 1 +
 renderhelpers.php      | 7 ++++++-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/lang/en/attendance.php b/lang/en/attendance.php
index 9ee7e19..80debd0 100644
--- a/lang/en/attendance.php
+++ b/lang/en/attendance.php
@@ -599,6 +599,7 @@ $string['tuseremail'] = 'Email';
 $string['tusername'] = 'Full name';
 $string['ungraded'] = 'Ungraded sessions';
 $string['unknowngroup'] = 'Unknown group';
+$string['unknownstatus'] = 'Unknown status id: {$a}';
 $string['update'] = 'Update';
 $string['uploadattendance'] = 'Upload attendance by CSV';
 $string['usedefaultsubnet'] = 'Use default';
diff --git a/renderhelpers.php b/renderhelpers.php
index b1478b1..c5754e1 100644
--- a/renderhelpers.php
+++ b/renderhelpers.php
@@ -68,7 +68,12 @@ class user_sessions_cells_generator {
                     $this->construct_existing_status_cell($this->reportdata->statuses[$statusid]->acronym .
                                 " ({$points}/{$maxpoints})");
                 } else {
-                    $this->construct_hidden_status_cell($this->reportdata->allstatuses[$statusid]->acronym);
+                    if (!empty($this->reportdata->allstatuses[$statusid] && isset($this->reportdata->allstatuses[$statusid]->acronym))) {
+                        $statusac = $this->reportdata->allstatuses[$statusid]->acronym;
+                    } else {
+                        $statusac = get_string('unknownstatus', 'mod_attendance', $statusid);
+                    }
+                    $this->construct_hidden_status_cell($statusac);
                 }
                 if ($remarks) {
                     $this->construct_remarks_cell($this->reportdata->sessionslog[$this->user->id][$sess->id]->remarks);