Bug - spotify, screen sleep, wakes up to a frozen white screen.

When I am listening to spotify long enough that the screen goes to screen saver mode (random photos from my FB account) and I want to wake it up to pause the music or make another change, when I touch the screen to wake it up, instead of the spotify app (or even home screen) it wakes up to a white screen. The only thing I can do is press the Home button, navigate to spotify and reopen it.

If I am about to take a call, it takes a long time to navigate around this Bug.