Fatal error: Uncaught TypeError: getUserRank(): Argument #1 ($userId) must be of type string, null given, called in /var/web/kairoxbuild.com/public/learn-english/leaderboard.php on line 16 and defined in /var/web/kairoxbuild.com/includes/learn-english-db.php:471
Stack trace:
#0 /var/web/kairoxbuild.com/public/learn-english/leaderboard.php(16): getUserRank(NULL)
#1 {main}
thrown in /var/web/kairoxbuild.com/includes/learn-english-db.php on line 471