Upon deploying to non-WP projects:
```
PHP Error: Argument 1 passed to CentralIdLookup::namesFromCentralIds() must be an instance of array, string given
#0 /srv/mediawiki/php-1.31.0-wmf.26/includes/user/CentralIdLookup.php(180): MWExceptionHandler::handleError(integer, string, string, integer, array, array)
#1 /srv/mediawiki/php-1.31.0-wmf.26/extensions/Echo/Hooks.php(494): CentralIdLookup->namesFromCentralIds(string, User)
#2 /srv/mediawiki/php-1.31.0-wmf.26/includes/Hooks.php(177): EchoHooks::getPreferences(User, array)
#3 /srv/mediawiki/php-1.31.0-wmf.26/includes/Hooks.php(205): Hooks::callHook(string, array, array, NULL)
#4 /srv/mediawiki/php-1.31.0-wmf.26/includes/preferences/DefaultPreferencesFactory.php(137): Hooks::run(string, array)
#5 /srv/mediawiki/php-1.31.0-wmf.26/extensions/GlobalPreferences/includes/GlobalPreferencesFactory.php(106): MediaWiki\Preferences\DefaultPreferencesFactory->getFormDescriptor(User, RequestContext)
#6 /srv/mediawiki/php-1.31.0-wmf.26/extensions/GlobalPreferences/includes/GlobalPreferencesFactory.php(343): GlobalPreferences\GlobalPreferencesFactory->getFormDescriptor(User, RequestContext)
#7 /srv/mediawiki/php-1.31.0-wmf.26/extensions/GlobalPreferences/includes/Hooks.php(162): GlobalPreferences\GlobalPreferencesFactory->setGlobalPreferences(array, RequestContext)
#8 /srv/mediawiki/php-1.31.0-wmf.26/includes/Hooks.php(177): GlobalPreferences\Hooks::onPreferencesFormPreSave(array, GlobalPreferences\GlobalPreferencesForm, User, boolean, array)
#9 /srv/mediawiki/php-1.31.0-wmf.26/includes/Hooks.php(205): Hooks::callHook(string, array, array, NULL)
#10 /srv/mediawiki/php-1.31.0-wmf.26/includes/preferences/DefaultPreferencesFactory.php(1602): Hooks::run(string, array)
#11 /srv/mediawiki/php-1.31.0-wmf.26/includes/preferences/DefaultPreferencesFactory.php(1632): MediaWiki\Preferences\DefaultPreferencesFactory->saveFormData(array, GlobalPreferences\GlobalPreferencesForm)
#12 /srv/mediawiki/php-1.31.0-wmf.26/includes/preferences/DefaultPreferencesFactory.php(1433): MediaWiki\Preferences\DefaultPreferencesFactory->submitForm(array, GlobalPreferences\GlobalPreferencesForm)
#13 /srv/mediawiki/php-1.31.0-wmf.26/includes/htmlform/HTMLForm.php(671): Closure$MediaWiki\Preferences\DefaultPreferencesFactory::getForm(array, GlobalPreferences\GlobalPreferencesForm)
#14 /srv/mediawiki/php-1.31.0-wmf.26/includes/htmlform/HTMLForm.php(563): HTMLForm->trySubmit()
#15 /srv/mediawiki/php-1.31.0-wmf.26/includes/htmlform/HTMLForm.php(578): HTMLForm->tryAuthorizedSubmit()
#16 /srv/mediawiki/php-1.31.0-wmf.26/includes/specials/SpecialPreferences.php(118): HTMLForm->show()
#17 /srv/mediawiki/php-1.31.0-wmf.26/extensions/GlobalPreferences/includes/SpecialGlobalPreferences.php(63): SpecialPreferences->execute(NULL)
#18 /srv/mediawiki/php-1.31.0-wmf.26/includes/specialpage/SpecialPage.php(522): GlobalPreferences\SpecialGlobalPreferences->execute(NULL)
#19 /srv/mediawiki/php-1.31.0-wmf.26/includes/specialpage/SpecialPageFactory.php(579): SpecialPage->run(NULL)
#20 /srv/mediawiki/php-1.31.0-wmf.26/includes/MediaWiki.php(288): SpecialPageFactory::executePath(Title, RequestContext)
#21 /srv/mediawiki/php-1.31.0-wmf.26/includes/MediaWiki.php(861): MediaWiki->performRequest()
#22 /srv/mediawiki/php-1.31.0-wmf.26/includes/MediaWiki.php(524): MediaWiki->main()
#23 /srv/mediawiki/php-1.31.0-wmf.26/index.php(42): MediaWiki->run()
#24 /srv/mediawiki/w/index.php(3): include(string)
#25 {main}
```
https://logstash.wikimedia.org/app/kibana#/doc/logstash-*/logstash-2018.03.21/mediawiki?id=AWJKqHsdU5mXXxqDXcr0&_g=(refreshInterval:(display:Off,pause:!f,value:0),time:(from:now%2Fy,mode:quick,to:now))
Seems to have something to do with the user blacklist.