Deprecated: str_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in /opt/app/lib/outputrenderers.php on line 1530

Exception - Call to a member function get_all_userids_for_instance() on null

Debug info:

Error code: generalexceptionmessage

Stack trace:

    line 181 of /communication/classes/helper.php: Error thrown

    line 561 of /communication/classes/hook_listener.php: call to core_communication\helper::update_course_communication_room_membership()

    line ? of unknownfile: call to core_communication\hook_listener::remove_communication_memberships_for_enrol_instance_deletion()

    line 299 of /lib/classes/hook/manager.php: call to call_user_func()

    line 2768 of /lib/enrollib.php: call to core\hook\manager->dispatch()

    line 1192 of /lib/enrollib.php: call to enrol_plugin->delete_instance()

    line 4888 of /lib/moodlelib.php: call to enrol_course_delete()

    line 4667 of /lib/moodlelib.php: call to remove_course_contents()

    line 78 of /course/delete.php: call to delete_course()