I've had the same issue before
Have you tried re-download the rom
tnx for the advice , but i couldn't find the link for the suggested kernel .
And how exactly to save call log??
If you're using TWRP
reboot into recovery mode
Click on mount and tick the system
Then click on advanced and select file manager and locate your downloaded apk
(By default it will be in sdcard/download)
Click on it and select copy
Then head to system/priv-app/SamsungDialer
Paste it there and reboot your device
Before you start make a backup for your call log
You may need to clear phone app cashe and data if it crashes after the downgrade