[Mailman-Users] Mail 2.1.12: We're sorry, we hit a bug!

[Srinivas B.]

Hi

Environment: Mailman 2.1.12 on Amazon Linux 2012 with Python 2.6.9 and
Virtualmin 4.0.5 GPL

All our lists are under Emergency moderation.
When a moderator goes to process held-messages and select "Preserve
messages for the site administrator", then we see the following error:

Bug in Mailman version 2.1.12

We're sorry, we hit a bug!

Please inform the webmaster for this site of this problem. Printing of
traceback and other system information has been explicitly inhibited, but
the webmaster can find this information in the Mailman error logs.

And then we see the following in /var/log/mailman/error file:

Feb 18 21:42:26 2014 admin(10273):
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
admin(10273): [----- Mailman Version: 2.1.12 -----]
admin(10273): [----- Traceback ------]
admin(10273): Traceback (most recent call last):
admin(10273):   File "/usr/lib/mailman/scripts/driver", line 112, in
run_main
admin(10273):     main()
admin(10273):   File "/usr/lib/mailman/Mailman/Cgi/admindb.py", line 165,
in main
admin(10273):     process_form(mlist, doc, cgidata)
admin(10273):   File "/usr/lib/mailman/Mailman/Cgi/admindb.py", line 716,
in process_form
admin(10273):     forward, forwardaddr)
admin(10273):   File "/usr/lib/mailman/Mailman/ListAdmin.py", line 167, in
HandleRequest
admin(10273):     forward, addr)
admin(10273):   File "/usr/lib/mailman/Mailman/ListAdmin.py", line 244, in
__handlepost
admin(10273):     msg = cPickle.load(fp)
admin(10273): ValueError: could not convert string to float


Not selecting the checkbox titled: Preserve messages for
site-administrator, is processing the emails just fine and there are no
issues.

Any insights on how to fix this error?

PS: Trying to search for the text "We're sorry, we hit a bug!" on
http://www.mail-archive.com/mailman-users%40python.org/, results in a
ModPython/Lucene exception... Looks like "single-quote" is throwing off the
search interface...

-Srinivas