[xmonad] XMonad.Prompt.Shell crashes X11 to console

[alexandre]

Hello,

I updated xmonad-0.6(darcs) yesterday and since then XMonad.Pompt.Shell
crashes xmonad to console. Steps to reproduce :
1) Spawn Shell prompt
2) type anything (doesnt have to be a valid command)
3) Press <CR>
4) X11 crashes to console with following message :
  xmonad-i386-linux: internal error: PAP object entered!
       (GHC version 6.8.2 for i386_unknown_linux)
        Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

My full xmonad.hs config (http://pastebin.com/m6804d9e1) and xinitrc
(http://pastebin.com/m42de0648) if needed. Don't know what other
relevant info to give, so don't hesitate to ask. 

In the mean time, back to dmenu.

Bests and long live XMonad :)
Alexandre