upstart-file-bridge assert failure: upstart-file-bridge.c:1162: Assertion failed in delete_handler: strstr (path, dir->path) == path

Triggered by restarting upstart-file-bridge job.

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: upstart 1.10-0ubuntu1 [modified: usr/share/upstart/sessions/upstart-file-bridge.conf]
ProcVersionSignature: Ubuntu 3.11.0-4.9-generic 3.11.0-rc7
Uname: Linux 3.11.0-4-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.12.1-0ubuntu3
Architecture: i386
AssertionMessage: upstart-file-bridge.c:1162: Assertion failed in delete_handler: strstr (path, dir->path) == path
CrashCounter: 1
Date: Mon Sep 9 09:41:50 2013
ExecutablePath: /sbin/upstart-file-bridge
InstallationDate: Installed on 2010-10-21 (1054 days ago)
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release i386 (20101007)
MarkForUpload: True
ProcCmdline: upstart-file-bridge --daemon --user
ProcEnviron:
 PATH=(custom, user)
 LANGUAGE=en_GB
 XDG_RUNTIME_DIR=<set>
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
Signal: 6
SourcePackage: upstart
StacktraceTop:
 ?? ()
 ?? () from /lib/i386-linux-gnu/libnih.so.1
 ?? () from /lib/i386-linux-gnu/libnih.so.1
 nih_io_handle_fds () from /lib/i386-linux-gnu/libnih.so.1
 nih_main_loop () from /lib/i386-linux-gnu/libnih.so.1
Title: upstart-file-bridge assert failure: upstart-file-bridge.c:1162: Assertion failed in delete_handler: strstr (path, dir->path) == path
UpgradeStatus: Upgraded to saucy on 2013-06-23 (77 days ago)
UpstartBugCategory: Session
UpstartRunningSessionCount: 1
UpstartRunningSessionVersion: init (upstart 1.10)
UpstartRunningSystemVersion: init (upstart 1.10)
UserGroups: adm admin audio cdrom dialout kvm libvirtd lpadmin plugdev sambashare sbuild vboxusers
upstart.shutdown.override: manual