Gentoo's Bugzilla –
Attachment 361720 Details for
Bug 489120=app-admin/keepass-2.23 with =dev-lang/mono-3.2.3 - On window close: System.ObjectDisposedException: The object was used after being disposed. at System.Net.Sockets.Socket.Send (System.Byte[] buf) [0x00000] in <filename unknown>:0