Spotted in the logs. It seems like getCentralTouched() gets a handle for the wrong database (e.g. selectDB). The method itself looks fine, so I'm not sure how that is possible. That should never happen.
```
A database query error has occurred. Did you forget to run your application's database schema updater after upgrading?
Query: SELECT page_touched,pp_propname FROM `page` LEFT JOIN `page_props` ON ((page_id=pp_page) AND pp_propname = 'noglobal') WHERE page_namespace = '2' AND page_title = 'Bujo' LIMIT 1
Function: MediaWiki\GlobalUserPage\GlobalUserPage::getCentralTouched
Error: 1146 Table 'centralauth.page' doesn't exist (10.64.0.91)
#0 /srv/mediawiki/php-1.31.0-wmf.30/includes/libs/rdbms/database/Database.php(1422): Wikimedia\Rdbms\Database->makeQueryException(string, integer, string, string)
#1 /srv/mediawiki/php-1.31.0-wmf.30/includes/libs/rdbms/database/Database.php(1195): Wikimedia\Rdbms\Database->reportQueryError(string, integer, string, string, boolean)
#2 /srv/mediawiki/php-1.31.0-wmf.30/includes/libs/rdbms/database/Database.php(1648): Wikimedia\Rdbms\Database->query(string, string)
#3 /srv/mediawiki/php-1.31.0-wmf.30/includes/libs/rdbms/database/Database.php(1725): Wikimedia\Rdbms\Database->select(array, array, array, string, array, array)
#4 [internal function]: Wikimedia\Rdbms\Database->selectRow(array, array, array, string, array, array)
#5 /srv/mediawiki/php-1.31.0-wmf.30/includes/libs/rdbms/database/DBConnRef.php(49): call_user_func_array(array, array)
#6 /srv/mediawiki/php-1.31.0-wmf.30/includes/libs/rdbms/database/DBConnRef.php(268): Wikimedia\Rdbms\DBConnRef->__call(string, array)
#7 /srv/mediawiki/php-1.31.0-wmf.30/extensions/GlobalUserPage/includes/GlobalUserPage.php(212): Wikimedia\Rdbms\DBConnRef->selectRow(array, array, array, string, array, array)
#8 /srv/mediawiki/php-1.31.0-wmf.30/extensions/GlobalUserPage/includes/GlobalUserPage.php(174): MediaWiki\GlobalUserPage\GlobalUserPage::getCentralTouched(User)
#9 /srv/mediawiki/php-1.31.0-wmf.30/extensions/GlobalUserPage/includes/Hooks.php(57): MediaWiki\GlobalUserPage\GlobalUserPage::shouldDisplayGlobalPage(Title)
#10 /srv/mediawiki/php-1.31.0-wmf.30/includes/Hooks.php(177): MediaWiki\GlobalUserPage\Hooks::onTitleIsAlwaysKnown(Title, NULL)
#11 /srv/mediawiki/php-1.31.0-wmf.30/includes/Hooks.php(205): Hooks::callHook(string, array, array, NULL)
#12 /srv/mediawiki/php-1.31.0-wmf.30/includes/Title.php(4589): Hooks::run(string, array)
#13 /srv/mediawiki/php-1.31.0-wmf.30/includes/Title.php(4630): Title->isAlwaysKnown()
#14 /srv/mediawiki/php-1.31.0-wmf.30/includes/skins/Skin.php(1200): Title->isKnown()
#15 /srv/mediawiki/php-1.31.0-wmf.30/includes/skins/SkinTemplate.php(220): Skin::makeUrlDetails(string)
#16 /srv/mediawiki/php-1.31.0-wmf.30/includes/skins/SkinTemplate.php(303): SkinTemplate->setupTemplateForOutput()
#17 /srv/mediawiki/php-1.31.0-wmf.30/includes/skins/SkinTemplate.php(249): SkinTemplate->prepareQuickTemplate()
#18 /srv/mediawiki/php-1.31.0-wmf.30/includes/OutputPage.php(2388): SkinTemplate->outputPage()
#19 /srv/mediawiki/php-1.31.0-wmf.30/includes/MediaWiki.php(868): OutputPage->output(boolean)
#20 /srv/mediawiki/php-1.31.0-wmf.30/includes/libs/rdbms/lbfactory/LBFactory.php(496): Closure$MediaWiki::main()
#21 /srv/mediawiki/php-1.31.0-wmf.30/includes/libs/rdbms/lbfactory/LBFactory.php(153): Wikimedia\Rdbms\LBFactory->shutdownChronologyProtector(Wikimedia\Rdbms\ChronologyProtector, Closure$MediaWiki::main;1350, string, integer)
#22 /srv/mediawiki/php-1.31.0-wmf.30/includes/MediaWiki.php(634): Wikimedia\Rdbms\LBFactory->shutdown(integer, Closure$MediaWiki::main;1350, integer)
#23 /srv/mediawiki/php-1.31.0-wmf.30/includes/MediaWiki.php(575): MediaWiki::preOutputCommit(RequestContext, Closure$MediaWiki::main;1350)
#24 /srv/mediawiki/php-1.31.0-wmf.30/includes/MediaWiki.php(877): MediaWiki->doPreOutputCommit(Closure$MediaWiki::main;1350)
#25 /srv/mediawiki/php-1.31.0-wmf.30/includes/MediaWiki.php(524): MediaWiki->main()
#26 /srv/mediawiki/php-1.31.0-wmf.30/index.php(42): MediaWiki->run()
#27 /srv/mediawiki/w/index.php(3): include(string)
```