Chat window doesn't close when pressing ESC once; Program crashes when pressing ESC twice

[Sah Lee]

Usually the chat window should close when ESC is pressed. But occasionally this doesn't work.
When the bug happens, pressing ESC leaves me a chat window "frame" without any content (only grey window background, no text areas). Then I press ESC again, the chat window "frame" disappears, and Pidgin crashes.

According to the output of 'pidgin --debug' (see below), there should've been a core-dump happened. If I understand this correctly, a core-dump should trigger apport. But it didn't in this case.

The accounts I have are:
- WebQQ (pidgin-lwqq-unstable)
- Lync (pidgin-sipe)
- XMPP

Last few lines from the output of 'pidgin --debug':

(12:24:31) pidgin-libnotify: Conversation Updated (OTHER)
(12:24:31) pidgin-libnotify: Conversation Updated (OTHER)
(12:24:31) pidgin-libnotify: Conversation Updated (OTHER)

(Pidgin:9370): LIBDBUSMENU-GLIB-WARNING **: Trying to remove a child that doesn't believe we're its parent.
(12:24:31) accels: accel changed, scheduling save.
(12:24:31) accels: accel changed, scheduling save.
(12:24:31) accels: accel changed, scheduling save.
(12:24:31) accels: accel changed, scheduling save.
(12:24:31) accels: accel changed, scheduling save.
(12:24:31) pidgin-libnotify: Conversation Updated (UNSEEN)
(12:24:31) pidgin-libnotify: REMOVING ATTENTION FOR (im:prpl-webqq:30666345:285857285) (0)
(12:24:34) pidgin-libnotify: Removing source (im:prpl-webqq:30666345:285857285)
(12:24:35) util: Writing file blist.xml to directory /home/sah/.purple
(12:24:35) util: Writing file /home/sah/.purple/blist.xml
(12:24:36) accels: saving accels to /home/sah/.purple/accels
[12:24:38 PM]{"retcode":102,"errmsg":""}

/usr/bin/pidgin: line 10: 9370 Segmentation fault (core dumped) /usr/bin/pidgin.orig $*

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: pidgin 1:2.10.7-0ubuntu4.1 [modified: usr/bin/pidgin]
ProcVersionSignature: Ubuntu 3.8.0-19.30-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
Date: Tue May 14 12:25:06 2013
InstallationDate: Installed on 2012-08-12 (275 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: pidgin
UpgradeStatus: Upgraded to raring on 2013-04-26 (18 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.