==== Error ====
* mwversion: master``
```name=normalized_message
Precondition failed: This Title instance does not represent a proper page, but merely a link target
```
```name=exception.trace,lines=10
Original exception: [YIb0Vy1sB3RCSPte8h5OtAAAAAA] /wiki/Special:EditGrowthConfig Wikimedia\Assert\PreconditionException: Precondition failed: This Title instance does not represent a proper page, but merely a link target.
Backtrace:
from /srv/mediawiki/php-master/vendor/wikimedia/assert/src/Assert.php(49)
#0 /srv/mediawiki/php-master/includes/Title.php(4645): Wikimedia\Assert\Assert::precondition(boolean, string)
#1 /srv/mediawiki/php-master/includes/Title.php(4626): Title->assertProperPage()
#2 /srv/mediawiki/php-master/includes/PageProps.php(242): Title->getId()
#3 /srv/mediawiki/php-master/includes/PageProps.php(105): PageProps->getGoodIDs(Title)
#4 /srv/mediawiki/php-master/extensions/DiscussionTools/includes/Hooks/HookUtils.php(182): PageProps->getProperties(Title, array)
#5 /srv/mediawiki/php-master/extensions/DiscussionTools/includes/Hooks/PageHooks.php(48): MediaWiki\Extension\DiscussionTools\Hooks\HookUtils::isAvailableForTitle(Title)
#6 /srv/mediawiki/php-master/includes/HookContainer/HookContainer.php(160): MediaWiki\Extension\DiscussionTools\Hooks\PageHooks->onBeforePageDisplay(OutputPage, SkinVector)
#7 /srv/mediawiki/php-master/includes/HookContainer/HookRunner.php(1000): MediaWiki\HookContainer\HookContainer->run(string, array, array)
#8 /srv/mediawiki/php-master/includes/OutputPage.php(2642): MediaWiki\HookContainer\HookRunner->onBeforePageDisplay(OutputPage, SkinVector)
#9 /srv/mediawiki/php-master/includes/MediaWiki.php(930): OutputPage->output(boolean)
#10 /srv/mediawiki/php-master/includes/MediaWiki.php(943): MediaWiki::{closure}()
#11 /srv/mediawiki/php-master/includes/MediaWiki.php(550): MediaWiki->main()
#12 /srv/mediawiki/php-master/index.php(53): MediaWiki->run()
#13 /srv/mediawiki/php-master/index.php(46): wfIndexMain()
#14 /srv/mediawiki/w/index.php(3): require(string)
#15 {main}
```
==== Impact ====
(Beta) wikis down, classifying as train blocker.
==== Notes ====
Sounds to be caused by #discussiontools work.