Lock Screen Disappeared

Just randomly my lock screen has disappeared, it's set to swipe and i changed it to every setting but there is no lock screen, if I reboot it will show 1 time until I open it then it's gone, all stock no root, anyone have any ideas

Sent from my Nexus 6P using XDA-Developers mobile app

from xda-developers http://ift.tt/1Ulz35f
via IFTTT