[qmailtoaster] Illegal division by zero in sa-stats

[Tom Manliclic]

Hi,

When running sa-stats I'm getting this
Illegal division by zero at /usr/sbin/sa-stats line 291.

Does this tells me something is wrong with my installation? How can I 
fix this?
How can I be sure that SA is doing its job?

Thank you very much.
Tom