Wikimedia Bugzilla is closed!

CURL command:
============================
curl --silent --include \
 -F 'url'='title'\
 -F 'blog_name'='80'\
 -F 'article'='Main Page'\
 -F 'title'='Main Page'\
 'localhost/wiki/trackback.php'
============================

LocalSettings.php includes this: 
============================
$wgUseTrackbacks = true;
error_reporting (E_ALL); 
============================
(i.e. stricter error reporting, and trackbacks usage enabled).

HTML output contains:
============================
<br />
<b>Notice</b>:  Undefined index:  excerpt in
<b>/var/www/hosts/mediawiki/phase3/trackback.php</b> on line <b>47</b><br />
============================