It seems the 1.32.0-wmf.16 branch introduced the following error.
Message
[{exception_id}] {exception_url} UnexpectedValueException from line 187 of /srv/mediawiki/php-1.32.0-wmf.16/includes/libs/MapCacheLRU.php: The value of 'en' is not an array.
Details
url: /wiki/Special:CentralAutoLogin/setCookies #0 /srv/mediawiki/php-1.32.0-wmf.16/includes/cache/MessageCache.php(992): MapCacheLRU->setField(string, string, string) #1 /srv/mediawiki/php-1.32.0-wmf.16/includes/cache/MessageCache.php(901): MessageCache->getMsgFromNamespace(string, string) #2 /srv/mediawiki/php-1.32.0-wmf.16/includes/cache/MessageCache.php(868): MessageCache->getMessageForLang(LanguageEn, string, boolean, array) #3 /srv/mediawiki/php-1.32.0-wmf.16/includes/cache/MessageCache.php(809): MessageCache->getMessageFromFallbackChain(LanguageEn, string, boolean) #4 /srv/mediawiki/php-1.32.0-wmf.16/includes/Message.php(1297): MessageCache->get(string, boolean, LanguageEn) #5 /srv/mediawiki/php-1.32.0-wmf.16/includes/Message.php(849): Message->fetchMessage() #6 /srv/mediawiki/php-1.32.0-wmf.16/includes/Message.php(941): Message->toString(string) #7 /srv/mediawiki/php-1.32.0-wmf.16/includes/user/User.php(1053): Message->text() #8 /srv/mediawiki/php-1.32.0-wmf.16/extensions/CentralAuth/includes/session/CentralAuthSessionProvider.php(154): User::isUsableName(string) #9 /srv/mediawiki/php-1.32.0-wmf.16/includes/session/SessionManager.php(488): CentralAuthSessionProvider->provideSessionInfo(WebRequest) #10 /srv/mediawiki/php-1.32.0-wmf.16/includes/session/SessionManager.php(191): MediaWiki\Session\SessionManager->getSessionInfoForRequest(WebRequest) #11 /srv/mediawiki/php-1.32.0-wmf.16/includes/WebRequest.php(750): MediaWiki\Session\SessionManager->getSessionForRequest(WebRequest) #12 /srv/mediawiki/php-1.32.0-wmf.16/includes/session/SessionManager.php(130): WebRequest->getSession() #13 /srv/mediawiki/php-1.32.0-wmf.16/includes/Setup.php(841): MediaWiki\Session\SessionManager::getGlobalSession() #14 /srv/mediawiki/php-1.32.0-wmf.16/includes/WebStart.php(77): include(string) #15 /srv/mediawiki/php-1.32.0-wmf.16/index.php(39): include(string) #16 /srv/mediawiki/w/index.php(3): include(string) #17 {main}
url: /w/index.php?title=MediaWiki:OSM.js&action=raw&ctype=text/javascript #0 /srv/mediawiki/php-1.32.0-wmf.16/includes/cache/MessageCache.php(992): MapCacheLRU->setField(string, string, string) #1 /srv/mediawiki/php-1.32.0-wmf.16/includes/cache/MessageCache.php(901): MessageCache->getMsgFromNamespace(string, string) #2 /srv/mediawiki/php-1.32.0-wmf.16/includes/cache/MessageCache.php(868): MessageCache->getMessageForLang(LanguageEn, string, boolean, array) #3 /srv/mediawiki/php-1.32.0-wmf.16/includes/cache/MessageCache.php(809): MessageCache->getMessageFromFallbackChain(LanguageEn, string, boolean) #4 /srv/mediawiki/php-1.32.0-wmf.16/includes/Message.php(1297): MessageCache->get(string, boolean, LanguageEn) #5 /srv/mediawiki/php-1.32.0-wmf.16/includes/Message.php(849): Message->fetchMessage() #6 /srv/mediawiki/php-1.32.0-wmf.16/includes/Message.php(941): Message->toString(string) #7 /srv/mediawiki/php-1.32.0-wmf.16/includes/user/User.php(1053): Message->text() #8 /srv/mediawiki/php-1.32.0-wmf.16/extensions/CentralAuth/includes/session/CentralAuthSessionProvider.php(154): User::isUsableName(string) #9 /srv/mediawiki/php-1.32.0-wmf.16/includes/session/SessionManager.php(488): CentralAuthSessionProvider->provideSessionInfo(WebRequest) #10 /srv/mediawiki/php-1.32.0-wmf.16/includes/session/SessionManager.php(191): MediaWiki\Session\SessionManager->getSessionInfoForRequest(WebRequest) #11 /srv/mediawiki/php-1.32.0-wmf.16/includes/WebRequest.php(750): MediaWiki\Session\SessionManager->getSessionForRequest(WebRequest) #12 /srv/mediawiki/php-1.32.0-wmf.16/includes/session/SessionManager.php(130): WebRequest->getSession() #13 /srv/mediawiki/php-1.32.0-wmf.16/includes/Setup.php(841): MediaWiki\Session\SessionManager::getGlobalSession() #14 /srv/mediawiki/php-1.32.0-wmf.16/includes/WebStart.php(77): include(string) #15 /srv/mediawiki/php-1.32.0-wmf.16/index.php(39): include(string) #16 /srv/mediawiki/w/index.php(3): include(string) #17 {main}