xchat crashes with BadDrawable (invalid Pixmap or Window parameter) error in .xsession-errors

Recently (last few weeks?) xchat has started crashing overnight. The only errors reported that I can see is the text below in the .xsession-errors log.

It's working fine when I go to bed, however it's not always there when I come back to the machine ~8 hours later.

The program 'xchat' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadDrawable (invalid Pixmap or Window parameter)'.
  (Details: serial 4377476 error_code 9 request_code 14 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xchat 2.8.8-3ubuntu12
ProcVersionSignature: Ubuntu 3.2.0-56.86-generic 3.2.51
Uname: Linux 3.2.0-56-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
Date: Thu Nov 14 09:17:18 2013
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Alpha amd64 (20110803.1)
MarkForUpload: True
ProcEnviron:
 LANGUAGE=en_GB:en
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: xchat
UpgradeStatus: Upgraded to precise on 2012-05-01 (561 days ago)