@op do you got Truecaller installed or any other app like that?
Thanks for the tip!
I was talking to my brother today (he is a Nexus 4 owner) and he told me that after updating from 4.3 to 4.4 he had the same problem. He could only solve it by restarting his device. So i guess, this is a dialer bug. Clearing dialer data i dont think will help..
|black screen, call, incoming, incoming call, nexus 5|