--- ./nx-X11/programs/Xserver/xfixes/select.c.X.original 2015-02-13 14:03:44.792440567 +0100 +++ ./nx-X11/programs/Xserver/xfixes/select.c 2015-02-10 19:13:13.504697118 +0100 @@ -78,7 +78,9 @@ } for (e = selectionEvents; e; e = e->next) { - if (e->selection == selection->selection && (e->eventMask & eventMask)) + if (e->selection == selection->selection && + (e->eventMask & eventMask) && + !e->pClient->clientGone) { xXFixesSelectionNotifyEvent ev;