Steps to reproduce:
1) go to http://www.anildagia.com/shop
2) Click on Buy for product - Introduction to NLP
3) Click on Checkout
4) Complete the checkout procedure
5) Error occurs on URL - http://www.anildagia.com/shop/checkout/step5save
Joomla: 3.8.5
JoomShopping: 4.17.0
PHP: 7.2
MySQL: 5.6.38
Website Url: http://www.anildagia.com
JoomShopping: 4.17.0
PHP: 7.2
MySQL: 5.6.38
Website Url: http://www.anildagia.com