Screen goes black during phone calls

[knuxify]

(TODO: attach logs) When making a phone call, the screen goes black and the touchscreen doesn't work.

The dialer app is set as default in Settings.

[DeadSquirrel01]

mobile phones like a5 have something called "proximity sensor", so, unless it's not covered by your face,fingers et cetera, that's normal

[knuxify]

Alright, nevermind, figured it out: I covered my front camera with a sticker and didn't realize I also covered the proximity sensor.