Nonexistent

Riddle: I can be found where anything cannot; dead men eat me all the time, but if a living man eats me, he'll die. What am I?

Answer: I am nothing.

Source: https://www.riddles.com/87

I can be found where anything cannot; dead men eat me all the time, but if a living man eats me, he'll die. What am I? — Nonexistent by Anonymous v1.

Riddle: I can be found where anything cannot; dead men eat me all the time, but if a living man eats me, he'll die. What am I? Answer: I am nothing. — by Anonymous v2.