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Fatal error: Uncaught Error: Call to a member function isEmpty() on null in C:\xampp\htdocs\tiendasPHP-Webshop-AntiguaREDSYS\finpedido.php:11 Stack trace: #0 {main} thrown in C:\xampp\htdocs\tiendasPHP-Webshop-AntiguaREDSYS\finpedido.php on line 11