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In GNU Emacs 20.2.1 (i586-*-linux-gnu, X toolkit)
 of Fri Feb  6 1998 on madison
configured using `configure  --prefix=/usr/local --with-pop --with-x-toolkit=yes '--host=i586-*-linux-gnu''

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

From time to time, I'm getting the error mentioned in the subject and
I have no idea our to reproduce it repeatedly:-(. I've enclosed a
backtrace log, I've just had. So you have any idea why I get such an
error.

BTW, I use:

Semi-gnus 6.0.6 (based on Quassia Gnus v0.32)
SEMI 1.0.0 - \"Nukajūtaku-mae\"


Chris


Recent input:
menu-bar files make-frame switch-frame menu-bar tools 
gnus down-mouse-2 mouse-2 up menu-bar help-menu re
port-emacs-bug

Recent messages:
Reading active file from archive via nnfolder...done
Checking bogus newsgroups...done
Retrieving newsgroup: nnml:broult...
Fetching headers for nnml:broult...
Loading debug (compiled)...
Loading debug (compiled)...done
Entering debugger...
 [2 times]
Loading emacsbug (compiled)...
Loading emacsbug (compiled)...done