Phone: Xperia z3, original rom android 4.4.4
Client: Davdroid from googlePlay, V0.6.12
Server: Synology DSM 5.1-5022 Update 2 with Carddav Server 5.2.0-0021
Steps to reproduce the Problem:
Connect to DS via LanIp without Ssl (to keep it simple). Create a new contact on the phone with just a name and telephone-nr. In the DAVDroid Account.
After saving the contact details will be shown, but there is no name. If you edit the contact, the name field is empty.
After syncing the name field will be changed to: “nullnull” - On the phone and server.
Contacts which are downloaded from the server will have a name, but it is not possible to change it on the phone. Every other field is changeable.
It seems, that the contact Editor cant save values in the name field. A friend tried the same steps with his motorola razr xt910, Android 4.1.2, and had the same issue.