[Xmonad] shellPrompt kills xmonad

[Tobias Hammerschmidt]

Hi,

I've got an issue with the shellPrompt extension here. Everytime I'm 
entering some keys in the shellPrompt xmonad crashes. Sometimes it 
crashes after the first pressed key (e.g. 'a') and sometimes after the 
second key (e.g. 'c' than arbritrary letter). However it does not crash, 
if I open the shellPrompt and exit it by hitting ESC. I only notice this 
behaviour on NixOS. The same config is working on debian etch without 
crashing.