plank crashed with SIGABRT in g_assertion_message()

[Poisoned Dragon]

[DEBUG OUTPUT]
[INFO 13:32:07.356337] [AbstractMain:239] Plank version: 0.7.1.1118
[INFO 13:32:07.356492] [AbstractMain:240] Kernel version: 3.13.0-39-generic
[INFO 13:32:07.356606] [AbstractMain:241] GLib version: 2.40.2
[INFO 13:32:07.356732] [AbstractMain:242] GTK+ version: 3.10.8
[INFO 13:32:07.357142] [AbstractMain:244] + CSD support enabled
[INFO 13:32:07.357262] [AbstractMain:247] + HiDPI support enabled
[INFO 13:32:07.357368] [AbstractMain:249] Wnck version: 3.4.9
[INFO 13:32:07.357488] [AbstractMain:250] Cairo version: 1.13.1
[INFO 13:32:07.357606] [AbstractMain:251] Pango version: 1.36.3
[INFO 13:32:07.398631] [WindowControl:62] Window-manager: Xfwm4
[DEBUG 13:32:07.413191] [Preferences:328] Loading preferences from file '/home/poisoned_dragon/.config/plank/dock1/settings'
[DEBUG 13:32:07.501508] [Preferences:328] Loading preferences from file '/home/poisoned_dragon/.local/share/plank/themes/ImmUnity/dock.theme'
[DEBUG 13:32:07.505324] [ApplicationDockItemProvider:72] Unity: Initalizing LauncherEntry support
[DEBUG 13:32:07.505884] [ItemFactory:155] Loading dock items from '/home/poisoned_dragon/.config/plank/dock1/launchers'
[DEBUG 13:32:07.506971] [Preferences:328] Loading preferences from file '/home/poisoned_dragon/.config/plank/dock1/launchers/plank.dockitem'
[DEBUG 13:32:07.599580] [ApplicationDockItemProvider:157] Unity: com.canonical.Unity acquired
[DEBUG 13:32:07.636633] [DockWindow:298] dock window loaded

[CAUSE OF CRASH]
Crash occurs intermittently, when quitting Thunderbird Mail. Most times, Thunderbird closes without incident. It is the only application that seems to give plank any grief.

[ADDITIONAL INFO]
Graphics Card: Intel Mobile 945GM/GMS 943/940GML Express Integrated Graphics Controller bus-ID: 00:02.0
X.Org: 1.15.1
Drivers: intel (unloaded: fbdev,vesa)
Resolution: 1280x800@59.9hz
GLX Renderer: Mesa DRI Intel 945GM x86/MMX/SSE2
GLX Version: 1.4 Mesa 10.1.3
Direct Rendering: Yes
Distro: Xubuntu 14.04

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: plank 0.7.1+bzr1118-0ubuntu1~14.04~ricotz1 [origin: LP-PPA-ricotz-docky]
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic i686
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: i386
CrashDB: plank
CurrentDesktop: XFCE
Date: Sat Nov 15 12:54:24 2014
ExecutablePath: /usr/bin/plank
InstallationDate: Installed on 2014-02-22 (266 days ago)
InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20140121.1)
ProcCmdline: plank
ProcEnviron:
 LANGUAGE=en_US
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
Signal: 6
SourcePackage: plank
StacktraceTop:
 g_assertion_message () from /lib/i386-linux-gnu/libglib-2.0.so.0
 g_assertion_message_expr () from /lib/i386-linux-gnu/libglib-2.0.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgee-0.8.so.2
 gee_abstract_list_get () from /usr/lib/i386-linux-gnu/libgee-0.8.so.2
 ?? () from /usr/lib/i386-linux-gnu/libplank.so.0
SuspiciousXErrors.txt:

ThirdParty: True
Title: plank crashed with SIGABRT in g_assertion_message()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

[Rico Tzschichholz (ricotz)]

Fixed r1121