Parse error when opening a v0.7 code challenge

Created by: pavril

Describe the bug

The error occurred when accessing the leaderboard tab on a code challenge created in v0.7 http://193.55.48.132/mod/vplcc/view.php?p=leaderboard.view&id=7400 (Caseine's test environment).

To Reproduce

Visit http://193.55.48.132/mod/vplcc/view.php?p=leaderboard.view&id=7400

Expected behaviour

View the leaderboard

Screenshots