if ( $parserOutput === false ) {

			// Cache miss; parse and output it.
			$rev = Revision::newFromTitle( $this->getTitle(), $oldid );

			return $this->getOutputFromWikitext( $rev->getText(), $useParserCache );
		} else {
			return $parserOutput;
		}

$rev isn't checked to be defined. Seemingly LQT related..

-rakkaus/#mediawiki-i18n- [27-Feb-2011 15:25:03] PHP Fatal error: Call to a member function getText() on a non-object in /www/w/includes/Article.php on line 4572

Version: unspecified
Severity: normal