[Direct Transfer] Crash when cancelling a transfer while uploading a lot of files

Object 0x7fb349735810 destroyed while one of its QML signal handlers is in progress.
Most likely the object was deleted synchronously (use QObject::deleteLater() instead), or the application is running a nested event loop.
This behavior is NOT supported!
file:///.../data/qml/TransferItem.qml:91: function() { [native code] }
37912 Killed: 9               ${PYTHON_OPT} -m nxdrive