Getting un-asked for Log: "Look rotation viewing vector is zero"

My code seems to be doing everything I want it to. I’m getting no errors or warnings. But when hit Play I get the following console Log over and over…

Look rotation viewing vector is zero
UnityEngine.Quaternion:LookRotation(Vector3)

It’s has a Debug.Log style icon next to it as opposed to an error or warning icon.

The code line that’s producing it is this:

Quaternion newRotation = Quaternion.LookRotation (movement);

The variable “movement” is a Vector3 if that helps.

Can anyone shed some light on all this?

This happens when the parameter sent into look rotation has a magnitude of 0.