New error_log message from 2.2.13

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I recently upgraded my server to
Apache/2.2.13 (Unix) mod_ssl/2.2.13 OpenSSL/0.9.8i
mod_apreq2-20090110/2.7.1 mod_perl/2.0.5-dev Perl/v5.10.1
in which everything mentioned is new except OpenSSL.

It has been running fine, but there are a few messages in error_log,
of a type not seen before:

> [Fri Sep 04 23:15:52 2009] [error] [client 68.13.227.175] Handler
> for type-map returned invalid result code 53, referer: http://
> www.stumbleupon.com//refer.php?url=http%3A%2F%2Fwww.animalhe ad.com%
> 2Fcheelnks.html%3F_
> ... [04/Sep/2009:23:15:52 -0700] "GET /1n/walrus.jpg HTTP/1.1" 500
> - "http://www.stumbleupon.com//refer.php?... "Mozilla/4.0
> (compatible; MSIE 7.0;..."
>
> [Sat Sep 05 12:28:31 2009] [error] [client 68.49.95.123] Handler
> for type-map returned invalid result code 53, referer: http://
> www.animalhead.com/namricns.html
> ... [05/Sep/2009:12:28:31 -0700] "GET /1n/puma.jpg HTTP/1.1" 500 -
> "http://www.animalhead.com/namricns.html" "Mozilla/4.0 (compatible;
> MSIE 8.0; ...
>
> [Sat Sep 05 17:09:53 2009] [error] [client 98.224.21.166] Handler
> for type-map returned invalid result code 53, referer: http://
> www.animalhead.com/cheelnks.html?_
> ... [05/Sep/2009:17:09:53 -0700] "GET /1n/berbr.jpg HTTP/1.1" 500 -
> "http://www.animalhead.com/cheelnks.html?_" "Mozilla/5.0 (Windows;
> U; Windows NT 6.0; ..."


In each pair of lines, the 1st is from error_log while the 2nd is
from access_log (abbreviated).

All of the errors occurred on requests for jpg thumbnails that are
cached by conf statements like these:
> CacheFile /usr/local/apache2/htdocs/1n/aardvark.jpg
> CacheFile /usr/local/apache2/htdocs/1n/anteater.jpg


The error handling is stock Apache; the httpd.conf file was carried
over from earlier versions of 2.2, and includes:

> Alias /error/ "/usr/local/apache2/error/"
>
>
> AllowOverride None
> Options IncludesNoExec
> AddOutputFilter Includes html
> AddHandler type-map var
> Order allow,deny
> Allow from all
> LanguagePriority en cs de es fr it ja ko nl pl pt-br ro sv tr
> ForceLanguagePriority Prefer Fallback
>
>
> ErrorDocument 400 /error/HTTP_BAD_REQUEST.html.var
> ErrorDocument 401 /error/HTTP_UNAUTHORIZED.html.var
> ...


The only mod_perl2 handler that is invoked for a .jpg file is a fixup
handler, and it for sure :) only returns OK.

Are such errors familiar to anyone? Is there anything I can do to
eliminate them?

Thanks,
cmac


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to