Had it happen once.

He came up to me, like, snuggled up, vomited on me, in bed.

How I interpreted that:

I am his safe space.

He is scared.

I am the safe place to vomit.

... and this did basically work.

Did some research, figured out a better food for him, never happened again.

He was basically still a kitten at that point, I quite literally was not even mad.