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('71d708ba215d6c5...', NULL) #1 /var/www/html/index.php(83): verify_sha256_hash(1768107900, NULL) #2 {main} thrown in /var/www/html/index.php on line 21