motorola moto g – Can not access screen lock type settings

I have recently updated my Moto G5 on Android Oreo and since then my lock screen has automatically changed from pattern to scan.
When the phone starts, he always asks me to "grab your motive to start the Android device", but after starting the device, he never asks me the reason again.

I tried to change the lock screen, but as soon as I click on the lock type, the error message "settings stopped" is displayed.
I've cleared the cache configuration of the application, the data and the force have stopped, but not use.
I deleted my security credentials
I started in safe mode to see if an application is causing the problem, nothing has happened.

I do not want to reset my phone because it contains a huge amount of data and make a backup will be a huge puzzle