Rt 3.4.4 - can't create user

I get the following error when I try to create a user:

Can’t find Principals.id for OID 0
[Sat Dec 3 11:18:55 2005] [crit]: Couldn’t create a Principal on new
user create. (/opt/rt3/lib/RT/User_Overlay.pm:254)
[Sat Dec 3 11:18:55 2005] [crit]: Strange things are afoot at the
circle K (/opt/rt3/lib/RT/User_Overlay.pm:255)