Update from 1.11.x

public/main/inc/lib/notification.lib.php

@@ -528,6 +528,8 @@ class Notification extends Model
             'data' => [
                 'title' => $title,
                 'message' => $content,
+                'body' => $content,
+                'sound' => 'default',
             ],
             'notification' => [
                 'title' => $title,

public/main/lp/learnpath.class.php

@@ -4556,6 +4556,7 @@ class learnpath
                 $session = $em->getRepository('ChamiloCoreBundle:Session')->find($sessionId);
             }
 
+            if ($courseId != 0) {
                 $course = $courseRepo->find($courseId);
 
                 // Subscribed groups to a LP
@@ -4565,6 +4566,7 @@ class learnpath
                     $course,
                     $session
                 );
+            }
 
             if (!empty($subscribedGroupsInLp)) {
                 $groups = array_column($groups, 'iid');