mediawiki 500 internal error when visit the home page - 


 mediawiki came 500 internal error   fatal error: uncaught error: call member function getcode() on null in /var/www/wiki/includes/user/user.php:1578 stack trace: #0 /var/www/wiki/includes/user/user.php(5243): user::getdefaultoptions() #1 /var/www/wiki/includes/user/user.php(2859): user->loadoptions() #2 /var/www/wiki/includes/context/requestcontext.php(364): user->getoption('language') #3 /var/www/wiki/includes/message.php(380): requestcontext->getlanguage() #4 /var/www/wiki/includes/message.php(1257): message->getlanguage() #5 /var/www/wiki/includes/message.php(842): message->fetchmessage() #6 /var/www/wiki/includes/message.php(934): message->tostring('text') #7 /var/www/wiki/includes/exception/mwexceptionrenderer.php(254): message->text() #8 /var/www/wiki/includes/exception/mwexceptionrenderer.php(358): mwexceptionrenderer::msg('dberr-again', 'try waiting f...') #9 /var/www/wiki/includes/exception/mwexceptionrenderer.php(52): mwexceptionrenderer::reportoutagehtml(object(wikimedia\rdbms\dbconnectionerror)) #10 /var/www/wiki/includes/exception/mwexce in /var/www/wiki/includes/user/user.php on line 1578


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