Screen turns black after inactivity in the app

[rozd]

https://trello.com/c/1laAbufR/3-screen-turns-black-after-inactivity-in-the-app

If you do not touch the app for a while, app will dim, and then screen turns black. If you immediately go to wake phone by activating fingerprint scanner, app stays black and phone never goes to lock screen. But, if you wait about 3 seconds and then go to wake phone by activating fingerprint scanner, app flickers for a bit and displays app properly