gnome-panel crashed when Unity3D-based game is started

This bug was also reported: https://bugs.launchpad.net/bugs/1201095

but it was said to report it again and fill bug report, so I did. This is my first time filling bug report so please be gentle.

1) LSB Version: core-2.0-amd64:core-2.0-noarch:core-3.0-amd64:core-3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch

2) package version: 1:3.8.0-1ubuntu12.1

3) not crash gnome-panel and play the game

4) gnome panel crashed, game still runs well; however after restarting gnome-panel again trough:
/usr/bin/gnome-panel &> /dev/null &

some menus (eg. the Wine menu at the "Start" panel) is missing.

I will gladly provide additional information.

ProblemType: Crash
DistroRelease: Ubuntu 14.04
Package: gnome-panel 1:3.8.0-1ubuntu12.1
ProcVersionSignature: Ubuntu 3.13.0-32.57-generic 3.13.11.4
Uname: Linux 3.13.0-32-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.2
Architecture: amd64
CrashCounter: 1
CurrentDesktop: Unity
Date: Tue Aug 26 21:38:46 2014
ExecutablePath: /usr/bin/gnome-panel
ExecutableTimestamp: 1404229898
GsettingsChanges: b'org.gnome.gnome-panel.run-dialog' b'show-program-list' b'true'
InstallationDate: Installed on 2011-07-26 (1127 days ago)
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1)
ProcCmdline: gnome-panel
ProcCwd: /home/colombo
Signal: 5
SourcePackage: gnome-panel
StacktraceTop:
 ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 ?? () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 _XReply () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 XSync () from /usr/lib/x86_64-linux-gnu/libX11.so.6
 ?? () from /usr/lib/x86_64-linux-gnu/libcairo.so.2
Title: gnome-panel crashed with signal 5 in _XReply()
UpgradeStatus: Upgraded to trusty on 2014-06-14 (73 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare