Vec operators mean() and cross() throw 'is not a function'

Hi, sorry it is me again. Thanks for fixing the Mat.mean() issue. Now I wanted to use the vec mean() operator and got the following error:

Uncaught Exception:
TypeError: mat.mean(...).mean is not a function

I then tested out all the other vec operators and found that cross() also throws the same exception. All other operators worked fine. Am I doing something wrong? First I was calculating mat.mean() which gave me Vec4 { z: 0, y: 0, x: 0, w: 0 } The result I then used for the vec operator like so mat.mean().mean().