Catchable fatal error: Argument 1 passed to Title::equals() must be an instance of Title, null given in /srv/mediawiki/php-1.29.0-wmf.18/includes/Title.php on line 4282
Error started when I pushed 1.29.0-wmf.18 to group1 today
Logstash Link: https://logstash.wikimedia.org/goto/3c9617dc70c814c02568962c944a62bc
```
#0 /srv/mediawiki/php-1.29.0-wmf.18/includes/Title.php(4282): MWExceptionHandler::handleError(integer, string, string, integer, array, array)
#1 /srv/mediawiki/php-1.29.0-wmf.18/extensions/ProofreadPage/includes/page/ProofreadPagePage.php(121): Title->equals(NULL)
#2 /srv/mediawiki/php-1.29.0-wmf.18/extensions/ProofreadPage/includes/page/ProofreadPagePage.php(102): ProofreadPagePage->findIndexTitle()
#3 /srv/mediawiki/php-1.29.0-wmf.18/extensions/ProofreadPage/includes/page/ProofreadPagePage.php(173): ProofreadPagePage->getIndex()
#4 /srv/mediawiki/php-1.29.0-wmf.18/extensions/ProofreadPage/includes/page/ProofreadPagePage.php(257): ProofreadPagePage->getImageWidth()
#5 /srv/mediawiki/php-1.29.0-wmf.18/extensions/ProofreadPage/includes/page/PageViewAction.php(43): ProofreadPagePage->getPageContainerEnd()
#6 /srv/mediawiki/php-1.29.0-wmf.18/includes/MediaWiki.php(497): ProofreadPage\Page\PageViewAction->show()
#7 /srv/mediawiki/php-1.29.0-wmf.18/includes/MediaWiki.php(291): MediaWiki->performAction(Article, Title)
#8 /srv/mediawiki/php-1.29.0-wmf.18/includes/MediaWiki.php(860): MediaWiki->performRequest()
#9 /srv/mediawiki/php-1.29.0-wmf.18/includes/MediaWiki.php(521): MediaWiki->main()
#10 /srv/mediawiki/php-1.29.0-wmf.18/index.php(43): MediaWiki->run()
#11 /srv/mediawiki/w/index.php(3): include(string)
#12 {main}
```