Warning: Trying to access array offset on value of type null in /var/www/html/config.php on line 63

Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in /var/www/html/config.php:63 Stack trace: #0 /var/www/html/config.php(63): in_array('en', NULL) #1 /var/www/html/index.php(1): require('/var/www/html/c...') #2 {main} thrown in /var/www/html/config.php on line 63