scratch-text-editor crashes when empty directory selected in FileManager extension

With the File Manager extension selected, if an empty subdirectory is selected in the tree-view and the arrow to its left clicked, then a non-existent sub-directory is shown. If this non-existent directory is selected then the program crashes with the following messages (when run from command line):

[_LOG_LEVEL_DEBUG 12:38:53.496622] gof-directory-async.vala:490: found cached dir file:///home/jeremy
[_LOG_LEVEL_DEBUG 12:38:53.496767] >>>>reuse file file:///home/jeremy/ScratchTestEmpty
[_LOG_LEVEL_DEBUG 12:38:53.496897] gof-directory-async.vala:90: dir file:///home/jeremy/ScratchTestEmpty ref_count 2
[_LOG_LEVEL_DEBUG 12:38:53.497038] gof-directory-async.vala:233: list directory file:///home/jeremy/ScratchTestEmpty
[_LOG_LEVEL_FATAL 12:38:59.281378] [GLib-GObject] g_object_ref: assertion `G_IS_OBJECT (object)' failed
[_LOG_LEVEL_FATAL 12:38:59.281530] Scratch will not function properly.
Segmentation fault (core dumped)

Bug occurs on newly updated system (from daily) and also when built from source from trunk (1.1.1)

ProblemType: Bug
DistroRelease: elementary OS 0.2
Package: scratch-text-editor 1.1.1+r1012-0+pkg39~precise1 [origin: LP-PPA-elementary-os-daily]
ProcVersionSignature: Ubuntu 3.2.0-40.64-generic-pae 3.2.40
Uname: Linux 3.2.0-40-generic-pae i686
ApportVersion: 2.0.1-0ubuntu17.1+elementary3~precise1
Architecture: i386
CrashDB: scratch_text_editor
Date: Mon Apr 1 12:32:04 2013
GsettingsChanges:

InstallationMedia: elementary OS 0.2 "Luna" - Beta 1 i386 (20121114)
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: scratch-text-editor
UpgradeStatus: No upgrade log present (probably fresh install)