Minification breaks my website before I even start

I would like to try to use the minification feature in the Hummingbird plugin but as soon as I turn it on my whole website breaks before I even start going through any of the settings. I have tried turning off all of the settings so that I can go through individually and test the result but it doesn't make a difference, my website still goes haywire. Can you advise if there is a workaround?