Dexophobia

In my program, when it ends it crashes the entire computer, what might be happening here? io = require("io") io.write("Press w") while true do input = io.read() if input == "w" then break else io.write("Wrong key!") end io.write("Correct key!") The Error is: /bin/sh.lua:14: attempt to index field 'stdin' (a nill value) stack traceback: init:18: in function <init:17> (...tail calls...) /bin/sh.lua:14: in main chunk [C]: in function 'xpcall' machine:798: in f