Fatal error: Uncaught TypeError: array_key_exists(): Argument #2 ($array) must be of type array, null given in /home/paulcost/public_html/nftmarket/install/php/Helper.php:155 Stack trace: #0 /home/paulcost/public_html/nftmarket/install/index.php(45): get_purchase_data() #1 {main} thrown in /home/paulcost/public_html/nftmarket/install/php/Helper.php on line 155