diff --git a/mod/assign/feedback/editpdf/classes/task/convert_submissions.php b/mod/assign/feedback/editpdf/classes/task/convert_submissions.php
index 2c97a944154..9c5505db1c1 100644
--- a/mod/assign/feedback/editpdf/classes/task/convert_submissions.php
+++ b/mod/assign/feedback/editpdf/classes/task/convert_submissions.php
@@ -85,8 +85,8 @@ class convert_submissions extends scheduled_task {
             } else {
                 $members = $assignment->get_submission_group_members($submission->groupid, true);
 
-                foreach ($members as $memberid) {
-                    array_push($users, $memberid);
+                foreach ($members as $member) {
+                    array_push($users, $member->id);
                 }
             }