Fix bug in kernel that meant I had to ignore (0, 0).
Fix bug in kernel that meant I had to ignore (0, 0).

pauldoo/scratch,pauldoo/racepoint,pauldoo/scratch,pauldoo/scratch,pauldoo/scratch,pauldoo/scratch,pauldoo/scratch,pauldoo/scratch,pauldoo/scratch,pauldoo/scratch,pauldoo/scratch,pauldoo/scratch,pauldoo/scratch,pauldoo/scratch,pauldoo/scratch