seroxatmad on "500 Internal Server Error"

I have just updated my site via the nightly build and receive a 500 Server Error, this seems to be happening every time I do an upgrade. I am running 1.4.4

The Server log states:

[Fri Jan 18 05:51:40 2013] [error] [client 80.229.19.251] Premature end of script headers: index.php, referer: http://www.thestottfamily.co.uk/zp-core/setup/index.php?autorun=gallery

Cheers

John