My professor skipped me on Christmas bonus payment
I think you need a more serious conversation with your advisor. You need to know if he is unhappy with your performance and if there are things you need to do to improve it. If the answer is no, then you can bring up that you didn't get a bonus. Perhaps it was a clerical issue or an issue in the delivery. But if you are not meeting expectations it would be a time for reflection.
But asking about your performance rather than your bonus would show some sense of seriousness about your work.