IsNormalized Error

Hello

I randomly get this error IsNormalized (ray.GetDirection ()) and IsNormalized (dir). I'm not sure what it means. And the error happens randomly so I can't figure out how to recreate it for problem solving. Anyone know what this error means or how to fix it? Or is it just a problem with the Unity Editor?

Here's the code that's causing the error.

Code (CSharp):

1. if (Physics.Linecast (go.transform.position, transform.position, out hit, RaycastLayers) && go != null)
2.             {
3.                 BehindWall = true;
4.             }
5.             else
6.             {
7.                 BehindWall = false;
8.             }

Thank you for your time!

 

Here's an image of the error too.