Fatal error: Uncaught TypeError: hash_equals(): Argument #2 ($user_string) must be of type string, null given in /var/www/html/index.php:21 Stack trace: #0 /var/www/html/index.php(21): hash_equals('f587b99716579e7...', NULL) #1 /var/www/html/index.php(83): verify_sha256_hash(1773315612, NULL) #2 {main} thrown in /var/www/html/index.php on line 21