When CPULoad is missing from /server-status?auto the Anturis Agent gives error

Sometimes the CPULoad parameter given by the /server-status?auto is not present at all in its output.
This makes the Anturis Agent give an error.
It seems that the CPULoad is omited from the server-status?auto output when it's somewhat near zero. I've concluded this because for these cases the output in the server-status main page is

CPU Usage: u0 s0 cu0 cs0

Again the "n% CPU load" is not present.

I'm on Ubuntu Server 14.04 LTS in a AWS EC2 t2.micro instance.
Apache 2.4.7
ExtendedStatus is ON.

thx!
ztp