Came to my attention from @Jalexander
2015-11-19 00:00:30 mw1086 votewiki exception ERROR: [51c30b46] /w/index.php?title=Special:UserLogin&action=submitlogin&type=signup LogicException from line 2428 of /srv/mediawiki/php-1.27.0-wmf.7/includes/User.php: Cannot set a password for a user that is not in the database. {"exception_id":"51c30b46"}
[Exception LogicException] (/srv/mediawiki/php-1.27.0-wmf.7/includes/User.php:2428) Cannot set a password for a user that is not in the database.
#0 /srv/mediawiki/php-1.27.0-wmf.7/includes/User.php(2395): User->setPasswordInternal(NULL) #1 /srv/mediawiki/php-1.27.0-wmf.7/includes/specials/SpecialUserlogin.php(675): User->setPassword(NULL) #2 /srv/mediawiki/php-1.27.0-wmf.7/includes/specials/SpecialUserlogin.php(654): LoginForm->initUser(User, boolean) #3 /srv/mediawiki/php-1.27.0-wmf.7/includes/specials/SpecialUserlogin.php(363): LoginForm->addNewAccountInternal() #4 /srv/mediawiki/php-1.27.0-wmf.7/includes/specials/SpecialUserlogin.php(341): LoginForm->addNewAccountMailPassword() #5 /srv/mediawiki/php-1.27.0-wmf.7/includes/specialpage/SpecialPage.php(384): LoginForm->execute(NULL) #6 /srv/mediawiki/php-1.27.0-wmf.7/includes/specialpage/SpecialPageFactory.php(553): SpecialPage->run(NULL) #7 /srv/mediawiki/php-1.27.0-wmf.7/includes/MediaWiki.php(280): SpecialPageFactory::executePath(Title, RequestContext) #8 /srv/mediawiki/php-1.27.0-wmf.7/includes/MediaWiki.php(704): MediaWiki->performRequest() #9 /srv/mediawiki/php-1.27.0-wmf.7/includes/MediaWiki.php(506): MediaWiki->main() #10 /srv/mediawiki/php-1.27.0-wmf.7/index.php(43): MediaWiki->run() #11 /srv/mediawiki/w/index.php(3): include(string) #12 {main}