Fatal error: Uncaught TypeError: in_array(): Argument #2 ($haystack) must be of type array, null given in /customers/0/c/2/50languages.com/httpd.www/vocab/index.php:482 Stack trace: #0 /customers/0/c/2/50languages.com/httpd.www/vocab/index.php(482): in_array('ad', NULL) #1 {main} thrown in /customers/0/c/2/50languages.com/httpd.www/vocab/index.php on line 482