Flash with keeping Root + Knox 0x0!
Note : In This method, your bootloader will not upgrade, and maybe have some bugs!
DISCLAIMER: I will NOT be held responsible if you lose your Warranty, if you trigger KNOX or if your phone bursts into flames....
Same problem here.
I'll try re-flashing an original ROM if don't find an answer by tonight.
Edit: cleaned the Contacts App Data and Cache as a workaround, didn't have problem until now