wrapper-1.0 assert failure: *** Error in `/usr/lib/i386-linux-gnu/xfce4/panel/wrapper-1.0': free(): invalid pointer: 0xa5673008 ***

It happened when clicking the screenshooter icon I have placed in the top panel.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: xfce4-panel 4.11.0~0.git20140209.86a1b73-0ubuntu1
ProcVersionSignature: Ubuntu 3.13.0-10.30-generic 3.13.3
Uname: Linux 3.13.0-10-generic i686
ApportVersion: 2.13.2-0ubuntu5
Architecture: i386
AssertionMessage: *** Error in `/usr/lib/i386-linux-gnu/xfce4/panel/wrapper-1.0': free(): invalid pointer: 0xa5673008 ***
CurrentDesktop: XFCE
Date: Thu Feb 20 12:19:59 2014
ExecutablePath: /usr/lib/i386-linux-gnu/xfce4/panel/wrapper-1.0
InstallationDate: Installed on 2014-02-18 (2 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20140121.1)
ProcCmdline: /usr/lib/i386-linux-gnu/xfce4/panel/wrapper-1.0 /usr/lib/i386-linux-gnu/xfce4/panel/plugins/libscreenshooterplugin.so 21 31460535 screenshooter Screenshot Take\ screenshots\ of\ the\ entire\ screen,\ of\ the\ active\ window\ or\ of\ a\ region
Signal: 6
SourcePackage: xfce4-panel
StacktraceTop:
 __libc_message (do_abort=do_abort@entry=2, fmt=fmt@entry=0xb6f11330 "*** Error in `%s': %s: 0x%s ***\n") at ../sysdeps/posix/libc_fatal.c:175
 malloc_printerr (action=<optimized out>, str=0xb6f0ce0f "free(): invalid pointer", ptr=0xa5673008) at malloc.c:4924
 _int_free (av=0xb6f56420 <main_arena>, p=0xa5673000, have_lock=0) at malloc.c:3780
 g_free () from /lib/i386-linux-gnu/libglib-2.0.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgdk_pixbuf-2.0.so.0
Title: wrapper-1.0 assert failure: *** Error in `/usr/lib/i386-linux-gnu/xfce4/panel/wrapper-1.0': free(): invalid pointer: 0xa5673008 ***
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo