diff --git a/core/class/jsondb/JsonDb.class.php b/core/class/jsondb/JsonDb.class.php
index 8344c04..57278c8 100644
--- a/core/class/jsondb/JsonDb.class.php
+++ b/core/class/jsondb/JsonDb.class.php
@@ -143,7 +143,7 @@ class JsonDb extends \Prowebcraft\Dot
     public function save()
     {
         //$v = json_encode($this->data, JSON_UNESCAPED_UNICODE );
-        $v = json_encode($this->data, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_FORCE_OBJECT);
+        $v = json_encode($this->data, JSON_UNESCAPED_UNICODE | JSON_FORCE_OBJECT);
         $l = strlen($v);
         $t = 0;
         while ($t < 5) {
diff --git a/core/core.php b/core/core.php
index 1f2155e..dc22b42 100644
--- a/core/core.php
+++ b/core/core.php
@@ -1438,8 +1438,8 @@ class common
 			case self::GROUP_MEMBER:
 			case self::GROUP_VISITOR:
 				foreach ($c as $courseId => $value) {
-					$students = $this->getData(['enrolment', $courseId, 'students']);
-					if (in_array($userId, $students) === false) {
+					$students = $this->getData(['enrolment', $courseId]);
+					if (is_array($students[$userId]) === false) {
 						unset($c[$courseId]);
 					}
 				}