Use the correct array index, fixes #6328

Closes #6328

Merge request studip/studip!4797

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/models/Courseware/Instance.php b/lib/models/Courseware/Instance.php
index 29499ec..4fecbfa 100644
--- a/lib/models/Courseware/Instance.php
+++ b/lib/models/Courseware/Instance.php
@@ -593,8 +593,8 @@ class Instance
 
         $data = [];
         foreach ($statement as $row) {
-            $structuralElementId = $row['structural_element_id'];
-            unset($row['structural_element_id']);
+            $structuralElementId = $row['id'];
+            unset($row['id']);
 
             if (!isset($data[$structuralElementId])) {
                 $data[$structuralElementId] = [];