This bug has been created based on an anonymous crash report requested by the package maintainer.
Report URL: http://faf.lab.eng.brq.redhat.com/faf/reports/bthash/99f425c3a37e71ebd3a619680918ebd0b2a40f7f/
closing as upstream: https://github.com/NetworkManager/NetworkManager/pull/85
The bug is also other versions of NM, but is usually not visible and probably no bad effects.
Problem is, that if the settings-connection gets deleted while handling and authentication-request (asynchronously), when the request completes, it doesn't properly abort the action... needs fixing.
But I close this as UPSTREAM. Thanks!