Send Reminder under My Appointments broken

Moodle 3.7.3

Scheduler  - master @ 8f05a3ca804de2ae56c929344606c4da4798918f

Going to a scheduler, My Appointments, Send reminder results in the following error:

Exception - Argument 2 passed to scheduler_message_form::__construct() must be an instance of scheduler, instance of mod_scheduler\model\scheduler given, called in [dirroot]/mod/scheduler/teacherview.php on line 368