empathy assert failure: empathy:ERROR:empathy-tp-chat.c:1391:empathy_tp_chat_acknowledge_message: assertion failed: (m != NULL)

[potterscholar]

Binary package hint: empathy

not really sure what happened, i opened a new tab to talk to a second person and empathy froze and quit. its similar to Bug #444999, but with no explanation i cant be sure, also it is noted to upgrade packages and if the error is encountered again, file a new bug, i updated not more than an hour ago, which is why im filing this bug.
im using:
 2.28.1-1ubuntu1

and im running:
Ubuntu Karmic Koala 9.10

ProblemType: Crash
Architecture: i386
AssertionMessage: empathy:ERROR:empathy-tp-chat.c:1391:empathy_tp_chat_acknowledge_message: assertion failed: (m != NULL)
CheckboxSubmission: 8257d790e87034d9340ca56879838fc4
CheckboxSystem: e704f33cc0866ff0f0256a33de39ea1c
CrashCounter: 1
Date: Thu Oct 22 22:05:10 2009
DistroRelease: Ubuntu 9.10
ExecutablePath: /usr/bin/empathy
NonfreeKernelModules: nvidia
Package: empathy 2.28.1-1ubuntu1
ProcCmdline: empathy
ProcEnviron:
 SHELL=/bin/bash
 LANG=en_US.UTF-8
ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
Signal: 6
SourcePackage: empathy
StacktraceTop:
 __kernel_vsyscall ()
 raise () from /lib/tls/i686/cmov/libc.so.6
 abort () from /lib/tls/i686/cmov/libc.so.6
 g_assertion_message () from /lib/libglib-2.0.so.0
 g_assertion_message_expr () from /lib/libglib-2.0.so.0
Title: empathy assert failure: empathy:ERROR:empathy-tp-chat.c:1391:empathy_tp_chat_acknowledge_message: assertion failed: (m != NULL)
Uname: Linux 2.6.31-14-generic i686
UserGroups: adm admin cdrom dialout lpadmin netdev plugdev sambashare

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #453398, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.