Error on payment / validation | PayPal 3.6.1

[ThatDesignGroup]

Hi there,

I have installed the newest module for Paypal Europe (as I'm in Australia and the USA/Canada/Mexico module was no compatible). 3.6.1.

Upon finishing the order and making payment in PayPal, I encounter a Server 500 error. After enabling errors, this is what I'm faced with.

 

Fatal error: Uncaught exception 'PrestaShopException' with message 'Property OrderDetail->product_name is not valid' in /var/www/vhosts/tshirtsonly.com.au/mistatee/store/classes/ObjectModel.php:837 Stack trace: #0 /var/www/vhosts/tshirtsonly.com.au/mistatee/store/classes/ObjectModel.php(255): ObjectModelCore->validateFields() #1 /var/www/vhosts/tshirtsonly.com.au/mistatee/store/classes/ObjectModel.php(455): ObjectModelCore->getFields() #2 /var/www/vhosts/tshirtsonly.com.au/mistatee/store/classes/ObjectModel.php(417): ObjectModelCore->add(true, false) #3 /var/www/vhosts/tshirtsonly.com.au/mistatee/store/classes/order/OrderDetail.php(589): ObjectModelCore->save() #4 /var/www/vhosts/tshirtsonly.com.au/mistatee/store/classes/order/OrderDetail.php(613): OrderDetailCore->create(Object(Order), Object(Cart), Array, 2, 0, true, 0) #5 /var/www/vhosts/tshirtsonly.com.au/mistatee/store/classes/PaymentModule.php(279): OrderDetailCore->createList(Object(Order), Object(Cart), 2, Array, 0, true, 0) #6 /var/www/vhosts/tshirtsonly.com.au/m in /var/www/vhosts/tshirtsonly.com.au/mistatee/store/classes/ObjectModel.php on line 837

It appears as if the validation for the product_name for some reason is failing. I've gone through everything I can, and have been stressing for hours as this is quite urgent.

I'm obviously missing something small. Does anyone have any helpful advice they could offer?

Thanks in advance.