$stdin.getchar/STDIN.getchar when executed rubymine throws an Invalid Argument error

I tried using $stdin.getchar in one of my programs and Rubymine continually throws the following error.

Uncaught exception: Invalid argument
############################ .rb:4:in `getch'
############################getch.rb:4:in `<top (required)>'

The above error was thrown simply by executing

require 'io/console'

puts "Press any key"
input = $stdin.getch

running the code on the command-line or typing in irb poses no problem. Has anyone seen this or can recreate the issue?