Crash when disconnecting from non operational BLE device

1 QLowEnergyControllerPrivate::disconnectFromDevice qlowenergycontroller_bluez.cpp 729 0x75305534 
2 BluetoothGenericDevice::disconnectFromDevice BluetoothGenericDevice.cpp 228 0x76cff184 
3 BluetoothGenericDevice::deviceDisconnect BluetoothGenericDevice.cpp 45 0x76cfd814 
4 BluetoothGenericDevice::qt_static_metacall moc_BluetoothGenericDevice.cpp 208 0x76d2daf0 
5 BluetoothGenericDevice::qt_metacall moc_BluetoothGenericDevice.cpp 334 0x76d2e294 
6 QQmlObjectOrGadget::metacall qqmlpropertycache.cpp 1713 0x7572e318 
7 CallMethod qv4qobjectwrapper.cpp 1100 0x756b3e1c 
8 CallPrecise qv4qobjectwrapper.cpp 1348 0x756b46f4 
9 QV4::QObjectMethod::callInternal qv4qobjectwrapper.cpp 1838 0x756b560c 
10 QV4::Object::call qv4object_p.h 372 0x756c9250 
11 QV4::Runtime::method_callProperty qv4runtime.cpp 1102 0x756c9250 
12 ?? 0x62897eee
 

void QLowEnergyControllerPrivate::disconnectFromDevice()
{
    setState(QLowEnergyController::ClosingState);
    l2cpSocket->close(); <<<<< Missing check.
    resetController();
}