Disconnecting client

I am trying out the heartbeat example.
When I connect with another device to the heartrate server, I can successfully read the services and also subscribe characteristics.

If i disconnect from the server, following error is thrown:
udooer@udooneo:~$ sudo ./heartrate-server
qt.bluetooth.bluez: sending error response; request: 10 handle: 3 code: 2
qt.bluetooth.bluez: sending error response; request: 10 handle: 3 code: 2
qt.bluetooth.bluez: void QBluetoothSocketPrivate::_q_readNotify() 8 error: -1 "Connection reset by peer"
restarting service
qt.bluetooth.bluez: received advertising error

So the heartrate server can't restart the advertisement by calling QtLowEnergyController::startAdvertising(...).
If I comment the line, which tries to startAdvertising again, the error is thrown, too but without the last line "[...] received advertising error".

In a prerelease version of 5.8.0, the server worked properly