Help with linux error

[delfinnium]

My linux is doing something strange -

Currently I have linux mint 9 (i'm not sure which version it is), and i don't think i did any updates or anything, but recently, it suddenly started showing this error and hanging:

Process: 291 GLib-warning **: get pwuid_r(): failed due to unknown user id(0)

It first started last week, and then today it happened at least twice. Will I have to update my linux to Linux Mint 10?

:(