Odd utf.c error...Any Worries?

[The Matt]

Folks, can you help me with this.  I start my XFce4 with:

startxfce4 >& startxfce4.log

just so I can capture errors.  However, I noticed that I'm getting this
error quite a bit:

** (xfce-mcs-manager:2290): CRITICAL **: file utf8.c: line 34
(utf8_string_remove_controls): assertion `str != NULL' failed

often followed by the same error but with:
xfce4-panel:2301
xfdesktop:2299
xfce4-iconbox:2293

in various patterns.  I haven't caught what action causes it yet, but
I'm hoping someone here knows.  I haven't lost any functionality (that I
can see), so I'm not too worried, but I'd rather not have the message at
all.

Thanks,
Matt
-- 
I am a theoretical chemist.  Fear me!
 Matt Thompson -- http://ucsub.colorado.edu/~thompsma/
 440 UCB, Boulder, CO  80309-0440
 JILA A510, 303-492-4662
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