See that account with the Android icon and missing name? It's an account called "NothingToSeeHere". Does anybody know what could it be and how can I check it?
I turned it off and now I can't turn it on but it's still on the "Add Account" page. Although I can't click on it to show you the name, "NothingToSeeHere".
Here's the (sensitive data censored) dump from account service:
User UserInfo{0:XXXXXXXXXX:13}:
Accounts: 4
Account {name=XXXXXXX@gmail.com, type=com.facebook.auth.login}
Account {name=Messenger, type=com.facebook.messenger}
Account {name=XXXXXX XXXXX, type=hr.apisit.u03.kp}
Account {name=XXXXXXXX@gmail.com, type=com.google}
AccountId, Action_Type, timestamp, UID, TableName, Key Accounts History
-1,action_called_account_add,2016-01-02 03:14:40,10054,accounts,0
1,action_account_add,2016-01-02 03:15:44,10007,accounts,1
1,action_set_password,2016-01-02 03:15:44,10007,accounts,2
-1,action_called_account_add,2016-01-03 00:35:18,10007,accounts,3
2,action_account_add,2016-01-03 03:13:50,10156,accounts,4
3,action_account_add,2016-01-03 12:39:15,10149,accounts,5
4,action_account_add,2016-01-03 12:39:54,10148,accounts,6
5,action_account_add,2016-01-04 00:09:34,10132,accounts,7
-1,action_called_account_remove,2016-01-04 00:38:45,1000,accounts,8
1,action_account_remove,2016-01-04 00:38:45,10007,accounts,9
-1,action_called_account_remove,2016-01-04 00:39:48,1000,accounts,10
2,action_account_remove,2016-01-04 00:39:49,10156,accounts,11
-1,action_called_account_add,2016-01-04 00:41:43,0,accounts,12
6,action_account_add,2016-01-04 00:42:23,10007,accounts,13
6,action_set_password,2016-01-04 00:42:23,10007,accounts,14
7,action_account_add,2016-01-04 23:11:16,10156,accounts,15
-1,action_called_account_remove,2016-01-05 15:22:19,1000,accounts,16
7,action_account_remove,2016-01-05 15:22:20,10156,accounts,17
-1,action_called_account_add,2016-01-05 15:30:12,0,accounts,18
8,action_account_add,2016-01-05 15:30:13,10156,accounts,19
-1,action_called_account_remove,2016-01-05 15:30:20,1000,accounts,20
8,action_account_remove,2016-01-05 15:30:20,10156,accounts,21
-1,action_called_account_add,2016-01-05 15:35:37,0,accounts,22
-1,action_called_account_add,2016-01-05 15:35:44,0,accounts,23
-1,action_called_account_add,2016-01-05 15:35:51,0,accounts,24
-1,action_called_account_add,2016-01-05 15:35:56,0,accounts,25
-1,action_called_account_add,2016-01-05 15:36:36,0,accounts,26
-1,action_called_account_add,2016-01-05 15:37:13,0,accounts,27
Active Sessions: 6
Session: expectLaunch false, connected true, stats (0/0/0), lifetime 8307.921, addAccount, accountType zephyr.headlezz.net, requiredFeatures null
Session: expectLaunch false, connected true, stats (0/0/0), lifetime 7982.812, addAccount, accountType zephyr.headlezz.net, requiredFeatures null
Session: expectLaunch false, connected true, stats (0/0/0), lifetime 7976.194, addAccount, accountType zephyr.headlezz.net, requiredFeatures null
Session: expectLaunch false, connected true, stats (0/0/0), lifetime 7963.836, addAccount, accountType zephyr.headlezz.net, requiredFeatures null
Session: expectLaunch false, connected true, stats (0/0/0), lifetime 7923.559, addAccount, accountType zephyr.headlezz.net, requiredFeatures null
Session: expectLaunch false, connected true, stats (0/0/0), lifetime 7886.837, addAccount, accountType zephyr.headlezz.net, requiredFeatures null
RegisteredServicesCache: 12 services
ServiceInfo: AuthenticatorDescription {type=com.android.sim}, ComponentInfo{com.qualcomm.simcontacts/com.qualcomm.simcontacts.SimAuthenticateService}, uid 1000
ServiceInfo: AuthenticatorDescription {type=hr.apisit.u03.kp}, ComponentInfo{hr.apisit.u03.kp/hr.apisit.u03.kp.account.AccountAuthenticatorService}, uid 10132
ServiceInfo: AuthenticatorDescription {type=com.google}, ComponentInfo{com.google.android.gms/com.google.android.gms.auth.GoogleAccountAuthenticatorService}, uid 10007
ServiceInfo: AuthenticatorDescription {type=com.lge.sync}, ComponentInfo{com.android.contacts/com.android.contacts.model.AuthenticatorService}, uid 10020
ServiceInfo: AuthenticatorDescription {type=zephyr.headlezz.net}, ComponentInfo{com.lolsummoners/com.lolsummoners.logic.sync.AuthenticatorService}, uid 10156
ServiceInfo: AuthenticatorDescription {type=com.facebook.messenger}, ComponentInfo{com.facebook.orca/com.facebook.messaging.phonebookintegration.account.MessengerAuthenticatorService}, uid 10148
ServiceInfo: AuthenticatorDescription {type=com.skype.contacts.sync}, ComponentInfo{com.skype.raider/com.skype.android.service.AccountService}, uid 10130
ServiceInfo: AuthenticatorDescription {type=com.google.android.gm.legacyimap}, ComponentInfo{com.google.android.gm/com.android.email.service.LegacyImapAuthenticatorService}, uid 10069
ServiceInfo: AuthenticatorDescription {type=com.facebook.auth.login}, ComponentInfo{com.facebook.katana/com.facebook.katana.platform.FacebookAuthenticationService}, uid 10149
ServiceInfo: AuthenticatorDescription {type=com.google.android.gm.pop3}, ComponentInfo{com.google.android.gm/com.android.email.service.Pop3AuthenticatorService}, uid 10069
ServiceInfo: AuthenticatorDescription {type=com.lge.bioitplatform.sdservice}, ComponentInfo{com.lge.bioitplatform.sdservice.service/com.lge.bioitplatform.sdservice.service.server.syncadapter.AuthenticatorService}, uid 10010 ServiceInfo: AuthenticatorDescription {type=com.android.localphone}, ComponentInfo{com.qualcomm.simcontacts/com.qualcomm.simcontacts.PhoneAuthenticateService}, uid 1000
- Phone: LG G3 D855 32GB
- System: Android 6.0 Marshmallow (stock 30B rooted)

adb shell dumpsys accountand give us the result. – Firelord Jan 05 '16 at 15:34