d4z_c0nf on "[Theme: Customizr] functions.php UPADTE = White Screen of Death"

If you didn't change anything else, and I think you didn't change anything else, then the problem isn't about you.
Plugin? Hosting server?
Who knows, sorry, never happened to me.
Could this help?
http://www.wpbeginner.com/wp-tutorials/how-to-fix-the-wordpress-white-screen-of-death/