diff --git a/classes/observer.php b/classes/observer.php
index 16804a8..150a540 100644
--- a/classes/observer.php
+++ b/classes/observer.php
@@ -41,7 +41,7 @@ class mod_attendance_observer {
     public static function course_content_deleted(\core\event\course_content_deleted $event) {
         global $DB;
 
-        $attids = array_keys($DB->get_records('attendance', array('course' =>  $event->objectid), '', 'id'));
+        $attids = array_keys($DB->get_records('attendance', array('course' => $event->objectid), '', 'id'));
         $sessids = array_keys($DB->get_records_list('attendance_sessions', 'attendanceid', $attids, '', 'id'));
         if (attendance_existing_calendar_events_ids($sessids)) {
             attendance_delete_calendar_events($sessids);
diff --git a/db/events.php b/db/events.php
index afe87a6..6b877b3 100644
--- a/db/events.php
+++ b/db/events.php
@@ -23,6 +23,8 @@
  * @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
  */
 
+defined('MOODLE_INTERNAL') || die();
+
 // List of observers.
 $observers = array(
 
diff --git a/lib.php b/lib.php
index e3d6163..f1cd0fc 100644
--- a/lib.php
+++ b/lib.php
@@ -275,7 +275,7 @@ function attendance_grade_item_update($attendance, $grades=null) {
         $params = array('itemname' => $attendance->name, 'idnumber' => $attendance->cmidnumber);
     } else {
         // MDL-14303.
-        $params = array('itemname' => $attendance->name/*, 'idnumber'=>$attendance->id*/);
+        $params = array('itemname' => $attendance->name);
     }
 
     if ($attendance->grade > 0) {
diff --git a/renderhelpers.php b/renderhelpers.php
index 9c1a5c6..285649c 100644
--- a/renderhelpers.php
+++ b/renderhelpers.php
@@ -218,7 +218,7 @@ class user_sessions_cells_text_generator extends user_sessions_cells_generator {
     }
 }
 
-// Used to print simple time - 1am instead of 1:00am
+// Used to print simple time - 1am instead of 1:00am.
 function attendance_strftimehm($time) {
     $mins = userdate($time, '%M');
     if ($mins == '00') {