2014-07-01, 16:00
Sorry about that, I've just pushed 1.6.6 which should fix the crash issue when using no logfile. If you've already updated to 1.6.5, to update to 1.6.6 you may need to temporarily provide a valid logfile with "@logfile=/tmp/x update" or "@logfile=c:\x update" after which you should be fine again.