Wikimedia Bugzilla is closed!

MediaWiki: 1.8.2 
PHP: 5.1.4-pl0-gentoo (apache) 
PostgreSQL: PostgreSQL 8.1.4 on x86_64-pc-linux-gnu, compiled by GCC x86_64-pc-linux-gnu-gcc (GCC) 3.4.5 
(Gentoo 3.4.5, ssp-3.4.5-1.0, pie-8.7.9) 
+(Some Extensions)

After saving Changes of an article, the following message appears "sometimes" (can´t reproduce the 
specific circumstances). Nevertheless the changes are saved.

Notice: Undefined offset: -2 in (...)/mediawiki-test/mediawiki-1.8.2/languages/Language.php on line 368

Warning: pg_query() [function.pg-query]: Query failed: ERROR: duplicate key violates unique 
constraint "wl_user_namespace_title" in (...)/mediawiki-test/mediawiki-
1.8.2/includes/DatabasePostgres.php on line 381

A database error has occurred Query: INSERT INTO watchlist 
(wl_user,wl_namespace,wl_title,wl_notificationtimestamp) VALUES ('2','2','Stefanm',NULL) Function: 
WatchedItem::addWatch Error: 1 ERROR: duplicate key violates unique constraint "wl_user_namespace_title" 

Backtrace:

#0 (...)/mediawiki-test/mediawiki-1.8.2/includes/Database.php(651): DatabasePostgres->reportQueryError
('ERROR: duplica...', 1, 'INSERT INTO wa...', 'WatchedItem::ad...', false)
#1 (...)/mediawiki-test/mediawiki-1.8.2/includes/Database.php(1251): Database->query('INSERT INTO 
wa...', 'WatchedItem::ad...')
#2 (...)/mediawiki-test/mediawiki-1.8.2/includes/DatabasePostgres.php(498): Database->insert
('watchlist', Array, 'WatchedItem::ad...', Array)
#3 (...)/mediawiki-test/mediawiki-1.8.2/includes/WatchedItem.php(78): DatabasePostgres->insert
('watchlist', Array, 'WatchedItem::ad...', 'IGNORE')
#4 (...)/mediawiki-1.8.2/includes/User.php(1398): WatchedItem->addWatch()
#5 (...)/mediawiki-test/mediawiki-1.8.2/includes/User.php(1050): User->addWatch(Object(Title))
#6 (...)/mediawiki-test/mediawiki-1.8.2/includes/Article.php(2153): User->setNewtalk(true)
#7 (...)/mediawiki-test/mediawiki-1.8.2/includes/Article.php(1302): Article->editUpdates('== Namensr??
ume...', '', false, '20061108131525', '2458', true)
#8 (...)/mediawiki-test/mediawiki-1.8.2/includes/Article.php(1136): Article->doEdit('== Namensr??
ume...', '', 34)
#9 (...)/mediawiki-test/mediawiki-1.8.2/includes/EditPage.php(789): Article->updateArticle('== Namensr??
ume...', '', false, false, '', '')
#10 (...)/mediawiki-test/mediawiki-1.8.2/includes/EditPage.php(364): EditPage->attemptSave()
#11 (...)/mediawiki-test/mediawiki-1.8.2/includes/EditPage.php(217): EditPage->edit()
#12 (...)/mediawiki-test/mediawiki-1.8.2/includes/Wiki.php(391): EditPage->submit()
#13 (...)/mediawiki-test/mediawiki-1.8.2/includes/Wiki.php(50): MediaWiki->performAction(Object
(OutputPage), Object(Article), Object(Title), Object(User), Object(WebRequest))
#14 (...)/mediawiki-test/mediawiki-1.8.2/index.php(47): MediaWiki->initialize(Object(Title), Object
(OutputPage), Object(User), Object(WebRequest))
#15 {main}