diff --git a/classes/form/addsession.php b/classes/form/addsession.php
index 331f1fe..4f7d5b4 100644
--- a/classes/form/addsession.php
+++ b/classes/form/addsession.php
@@ -350,7 +350,9 @@ class addsession extends moodleform {
             $this->_form->setConstant('previoussessiondate', $sessstart);
         }
 
-        if (!empty($data['studentscanmark']) && $data['automark'] == ATTENDANCE_AUTOMARK_CLOSE) {
+        if (!empty($data['studentscanmark']) && isset($data['automark'])
+            && $data['automark'] == ATTENDANCE_AUTOMARK_CLOSE) {
+
             $cm            = $this->_customdata['cm'];
             // Check that the selected statusset has a status to use when unmarked.
             $sql = 'SELECT id
diff --git a/classes/form/updatesession.php b/classes/form/updatesession.php
index e3bdab9..748639c 100644
--- a/classes/form/updatesession.php
+++ b/classes/form/updatesession.php
@@ -223,7 +223,9 @@ class updatesession extends \moodleform {
             $errors['sestime'] = get_string('invalidsessionendtime', 'attendance');
         }
 
-        if (!empty($data['studentscanmark']) && $data['automark'] == ATTENDANCE_AUTOMARK_CLOSE) {
+        if (!empty($data['studentscanmark']) && isset($data['automark'])
+            && $data['automark'] == ATTENDANCE_AUTOMARK_CLOSE) {
+
             $cm            = $this->_customdata['cm'];
             // Check that the selected statusset has a status to use when unmarked.
             $sql = 'SELECT id