[Samba] string_to_sid: SI is not in a valid format

[Matt Savin]

Hello,

On AD domain member in both versions of samba 4.6.11 and 4.7.3 I'm getting
a lot of following messages:

[2017/12/28 15:54:03.838907,  3]
../libcli/security/dom_sid.c:210(dom_sid_parse_endp)
  string_to_sid: SID msavin is not in a valid format

msavin is my user name:

# wbinfo -n msavin
S-1-5-21-508332004-1178028025-157424832-1273 SID_USER (1)
# wbinfo  --lookup-sids S-1-5-21-508332004-1178028025-157424832-1273
S-1-5-21-508332004-1178028025-157424832-1273 -> <none>\mattiasz 1

>From smb.conf:

   winbind use default domain = true
   winbind offline logon = false
   disable netbios = yes
   winbind trusted domains only = no
   allow trusted domains = no

Any reason?

Thank you,
Matt