Nautilus crashes on first access to vfat drive

I have a fat32 partition mounted in etc/fstab as:

/dev/sda6 /mnt/fat32 vfat umask=000 0 0

Unlike the ntfs drive it does not get mounted automatically under 'Computer' but it shows up fine under /mnt/fat32. I've bookmarked it in Nautilus, or I can navigate to it directly.

The bug is: every once in a while when I acess the partition for the _first time_ time in a session, Natilus will crash. When I open it again, it is fine and it stays fine for the rest of the session. It doesn't happen every time, but perhaps every 5 or 10 sessions.