That's toxic for cats.
Coffee is much more toxic though, when I was a kid one of my female cats couldn't stand on her feet so I placed her in a safe place together with her 4-5 kittens-all still breast feeding. I gave her a full cup of milk with some sugar and nescafe inside which she consumed quickly.
I couldn't understand how the next day both the mother and the kitten were all dead...


I learned the reason years later