SkypekitAccount.cpp: UNSUPPORTED PROPERTY: 28

[kirs]

[LIBSKYPEKIT /home/vagrant/libskypekit/src/SkypekitAccount.cpp:42] SkypekitAccount::OnChange...
[LIBSKYPEKIT /home/vagrant/libskypekit/src/SkypekitAccount.cpp:63] UNSUPPORTED PROPERTY: 28
[LIBSKYPEKIT /home/vagrant/libskypekit/src/api.cpp:175] get event...
[LIBSKYPEKIT /home/vagrant/libskypekit/src/SkypekitQueue.cpp:89] SkypekitQueue::pop mutex locking
[LIBSKYPEKIT /home/vagrant/libskypekit/src/SkypekitQueue.cpp:91] SkypekitQueue::pop mutex locked
[LIBSKYPEKIT /home/vagrant/libskypekit/src/SkypekitQueue.cpp:100] SkypekitQueue::pop mutex unlocking
[LIBSKYPEKIT /home/vagrant/libskypekit/src/SkypekitQueue.cpp:102] SkypekitQueue::pop mutex unlocked

Sometimes with enabled DEBUG flag I'm getting such warnings about unsupported property. Is it ok?