protected function toEditContent( $text ) {

		if ( $text === false || $text === null ) {
			return $text;
		}

Reedy: I have no idea how bad this is, so if you just paste a stacktrace I'd appreciate if you could also set priority and severity.

[21-Oct-2013 18:35:11] Fatal error: Call to a member function getRedirectChain() on a non-object at /usr/local/apache/common-local/php-1.22wmf21/includes/EditPage.php on line 3169
Server: mw1211
Method: GET
URL: http://en.wikipedia.org/w/index.php?title=Massachusetts&action=edit&oldid=11488920
Backtrace:
#0 /usr/local/apache/common-local/php-1.22wmf21/includes/EditPage.php(3169): EditPage::getPreviewText()
#1 /usr/local/apache/common-local/php-1.22wmf21/includes/EditPage.php(2152): EditPage->getPreviewText()
#2 /usr/local/apache/common-local/php-1.22wmf21/includes/EditPage.php(441): EditPage->showEditForm()
#3 /usr/local/apache/common-local/php-1.22wmf21/includes/actions/EditAction.php(50): EditPage->edit()
#4 /usr/local/apache/common-local/php-1.22wmf21/includes/Wiki.php(448): EditAction->show()
#5 /usr/local/apache/common-local/php-1.22wmf21/includes/Wiki.php(312): MediaWiki->performAction(Object(Article), Object(Title))
#6 /usr/local/apache/common-local/php-1.22wmf21/includes/Wiki.php(602): MediaWiki->performRequest()
#7 /usr/local/apache/common-local/php-1.22wmf21/includes/Wiki.php(467): MediaWiki->main()
#8 /usr/local/apache/common-local/php-1.22wmf21/index.php(49): MediaWiki->run()
#9 /usr/local/apache/common-local/w/index.php(3): require('/usr/local/apac...')
#10 {main}

Both urls are now reachable. Looks like the revision on the server was fixed, because EditPage.php looks unchanged in the near of the getRedirectChain call.

The getRedirectChain call was removed with gerrit 105829, so this fatal will no longer be occured.