Hello,
Just ran in your post as I'm looking for help regarding similar problem. Did you solve the issue?
I found this thread: https://moodle.org/mod/forum/discuss.php?d=339212.
François
Assignment
"Undefined" popup grading online text submission
ការពិភាក្សាត្រូវបានបិទ ដូច្នេះអ្នកមិនអាចឆ្លើយតបទៀតទេ។