console.warn() cause js error on IE9

The two calls to "console.warn()" cause a javascript error on IE9 (see screenshot attached).
I think that checking for the existance of the object "console" should fix the error.

![wow_issue](https://cloud.githubusercontent.com/assets/376903/4120960/0a820580-32b7-11e4-890c-675ea7e5d520.png)