Restore on stable: fail on mini_racer 0.1.3

I read here that newer discourse versions should be able to cope with old backups and restore them but I can’t get anything more than that (on tests-passed):

[2016-10-30 05:01:31] 'some_user' has started the restore!
[2016-10-30 05:01:31] Marking restore as running...
[2016-10-30 05:01:31] Restore process was cancelled!
[2016-10-30 05:01:31] Trying to rollback...
[2016-10-30 05:01:31] There was no need to rollback
[2016-10-30 05:01:31] Notifying 'blabla' of the end of the restore...