Impossible to quit Nuxeo Drive when network connection has gone down

The quit button does not seem to work when the network connection with the server has just gone done.

Steps to reproduce:

1- Connect nuxeo drive demo to a remote server, e.g. http://nuxeo-drive.demo-aws.nuxeo.com/nuxeo

2- Turn off wifi

3- Right click the system tray icon menu and select quit

Expected:

The icon should have switched to gray and Drive should quit after a few seconds.

Observed:

The icon stays dark and the application does not quit.