full disclosure I don't have an IE 9 instance to test with, but I think this will break

Description

IE 9 does not support console unless dev tools is open.
http://stackoverflow.com/questions/5472938/does-ie9-support-console-log-and-is-it-a-real-function#comment15214547_5473193

A polyfill can prevent JS from breaking: https://github.com/paulmillr/console-polyfill

Environment

1. Operating system: Windows
2. Browser and version: IE 9

Reproducible Demo

I don't have an environment to test this with.