If Special:Watchlist has nothing to show to user, some warnings appear.
#0 DatabaseMysql->mysqlDataSeek() called at […/mediawiki-1.23.0/includes/db/DatabaseMysqlBase.php:377] #1 DatabaseMysqlBase->dataSeek() called at […/mediawiki-1.23.0/includes/specials/SpecialWatchlist.php:320] #2 SpecialWatchlist->outputChangesList() called at […/mediawiki-1.23.0/includes/specialpage/ChangesListSpecialPage.php:332] #3 ChangesListSpecialPage->webOutput() called at […/mediawiki-1.23.0/includes/specialpage/ChangesListSpecialPage.php:70] #4 ChangesListSpecialPage->execute() called at […/mediawiki-1.23.0/includes/specials/SpecialWatchlist.php:79] #5 SpecialWatchlist->execute() called at […/mediawiki-1.23.0/includes/specialpage/SpecialPage.php:379] #6 SpecialPage->run() called at […/mediawiki-1.23.0/includes/specialpage/SpecialPageFactory.php:503] #7 SpecialPageFactory::executePath() called at […/mediawiki-1.23.0/includes/Wiki.php:285] #8 MediaWiki->performRequest() called at […/mediawiki-1.23.0/includes/Wiki.php:588] #9 MediaWiki->main() called at […/mediawiki-1.23.0/includes/Wiki.php:447] #10 MediaWiki->run() called at […/mediawiki-1.23.0/index.php:46] <br /> <b>Warning</b>: mysql_data_seek() [<a href='function.mysql-data-seek'>function.mysql-data-seek</a>]: Offset 0 is invalid for MySQL result index 135 (or the query data is unbuffered) in <b>…/mediawiki-1.23.0/includes/db/DatabaseMysql.php</b> on line <b>186</b><br /> #0 DatabaseMysql->mysqlDataSeek() called at […/mediawiki-1.23.0/includes/db/DatabaseMysqlBase.php:377] #1 DatabaseMysqlBase->dataSeek() called at […/mediawiki-1.23.0/includes/specials/SpecialWatchlist.php:325] #2 SpecialWatchlist->outputChangesList() called at […/mediawiki-1.23.0/includes/specialpage/ChangesListSpecialPage.php:332] #3 ChangesListSpecialPage->webOutput() called at […/mediawiki-1.23.0/includes/specialpage/ChangesListSpecialPage.php:70] #4 ChangesListSpecialPage->execute() called at […/mediawiki-1.23.0/includes/specials/SpecialWatchlist.php:79] #5 SpecialWatchlist->execute() called at […/mediawiki-1.23.0/includes/specialpage/SpecialPage.php:379] #6 SpecialPage->run() called at […/mediawiki-1.23.0/includes/specialpage/SpecialPageFactory.php:503] #7 SpecialPageFactory::executePath() called at […/mediawiki-1.23.0/includes/Wiki.php:285] #8 MediaWiki->performRequest() called at […/mediawiki-1.23.0/includes/Wiki.php:588] #9 MediaWiki->main() called at […/mediawiki-1.23.0/includes/Wiki.php:447] #10 MediaWiki->run() called at […/mediawiki-1.23.0/index.php:46] <br /> <b>Warning</b>: mysql_data_seek() [<a href='function.mysql-data-seek'>function.mysql-data-seek</a>]: Offset 0 is invalid for MySQL result index 135 (or the query data is unbuffered) in <b>…/mediawiki-1.23.0/includes/db/DatabaseMysql.php</b> on line <b>186</b><br />