shotwell crashed with SIGSEGV in gtk_progress_bar_set_fraction()

I selected multiple photos and one video file and dragged it onto another desktop and dropped it there on a wordpress instance in chromium. Wordpress did not know to interpret the input correctly. So I repeated the dragging, then shotwell crashed.

ProblemType: Crash
DistroRelease: Ubuntu 13.10
Package: shotwell 0.15.0~pr1-0ubuntu2
ProcVersionSignature: Ubuntu 3.11.0-8.15-generic 3.11.1
Uname: Linux 3.11.0-8-generic i686
ApportVersion: 2.12.4-0ubuntu1
Architecture: i386
Date: Sun Sep 22 15:14:01 2013
ExecutablePath: /usr/bin/shotwell
InstallationDate: Installed on 2013-04-18 (156 days ago)
InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.2)
MarkForUpload: True
ProcCmdline: shotwell
ProcEnviron:
 LANGUAGE=en_US:en
 PATH=(custom, user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SegvAnalysis:
 Segfault happened at: 0xb701e1a5 <gtk_progress_bar_set_fraction+37>: mov (%esi),%edx
 PC (0xb701e1a5) ok
 source "(%esi)" (0xffff00ff) not located in a known VMA region (needed readable region)!
 destination "%edx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: shotwell
StacktraceTop:
 gtk_progress_bar_set_fraction () from /usr/lib/i386-linux-gnu/libgtk-3.so.0
 progress_dialog_set_percentage ()
 progress_dialog_monitor ()
 ?? ()
 ?? ()
Title: shotwell crashed with SIGSEGV in gtk_progress_bar_set_fraction()
UpgradeStatus: Upgraded to saucy on 2013-06-29 (85 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo