If I visit https://wikitech.wikimedia.org/wiki/Special:Notifications,
I get every time an exception "InvalidArgumentException"
trace:
#0 /srv/mediawiki/php-1.32.0-wmf.3/extensions/Echo/includes/formatters/SpecialNotificationsFormatter.php(111): EchoIcon::getUrl(string, string)
#1 /srv/mediawiki/php-1.32.0-wmf.3/extensions/Echo/includes/formatters/SpecialNotificationsFormatter.php(18): SpecialNotificationsFormatter->getIconURL(EchoOpenStackManagerPresentationModel)
#2 /srv/mediawiki/php-1.32.0-wmf.3/extensions/Echo/includes/formatters/EchoEventFormatter.php(63): SpecialNotificationsFormatter->formatModel(EchoOpenStackManagerPresentationModel)
#3 /srv/mediawiki/php-1.32.0-wmf.3/extensions/Echo/includes/DataOutputFormatter.php(171): EchoEventFormatter->format(EchoEvent)
#4 /srv/mediawiki/php-1.32.0-wmf.3/extensions/Echo/includes/DataOutputFormatter.php(136): EchoDataOutputFormatter::formatNotification(EchoEvent, User, string, LanguageEn)
#5 /srv/mediawiki/php-1.32.0-wmf.3/extensions/Echo/includes/special/SpecialNotifications.php(59): EchoDataOutputFormatter::formatOutput(EchoNotification, string, User, LanguageEn)
#6 /srv/mediawiki/php-1.32.0-wmf.3/includes/specialpage/SpecialPage.php(522): SpecialNotifications->execute(NULL)
#7 /srv/mediawiki/php-1.32.0-wmf.3/includes/specialpage/SpecialPageFactory.php(568): SpecialPage->run(NULL)
#8 /srv/mediawiki/php-1.32.0-wmf.3/includes/MediaWiki.php(288): SpecialPageFactory::executePath(Title, RequestContext)
#9 /srv/mediawiki/php-1.32.0-wmf.3/includes/MediaWiki.php(861): MediaWiki->performRequest()
#10 /srv/mediawiki/php-1.32.0-wmf.3/includes/MediaWiki.php(524): MediaWiki->main()
#11 /srv/mediawiki/php-1.32.0-wmf.3/index.php(42): MediaWiki->run()
#12 /srv/mediawiki/w/index.php(3): include(string)
#13 {main}