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PHP Fatal error:  Call to undefined method WikiPage::getOldID() in /usr/local/apache/common-local/php-1.21wmf1/extensions/Collection/Collection.body.php on line 817

if ( $oldid < 0 ) {
	$article = new WikiPage( $articleTitle );
} else {
	$article = new Article( $articleTitle, $oldid );
}
if ( !$article->exists() ) {
	return null;
}
$revision = Revision::newFromTitle( $articleTitle, $article->getOldID() );

Article has the getOldID method, WikiPage doesn't..

So if we've had $oldid < 0, we've got a wikipage object, and then we can't pull the old id from that