Possible bug in vacation days

I received the following mail from littlegolem:

Little Golem - Vacation.

In one of your games expired time and you receive one day vacation. In all of your games was time increased (24 hours).

You have still -1 vacation days for this year.

And I'm pretty sure that I had 0 vacation days left. So someone should have won a game against me. I guess we all agree that nobody should get a vacation day when he has consumed all the 20 of them.

bump