After I implemented the patch SUPEE 10415, checkout cart url /checkout/cart/ got an error, and when I reverted the Patch it now works as expected but I need to implement the patch asap.
Magento Stack Exchange is a question and answer site for users of the Magento e-Commerce platform. It only takes a minute to sign up.Sign up to join this community
After patching SUPEE-10415, causes an error “Unsupported data type N” Solution: The cause of this issue is not having SUPEE-8788 V2 installed. To fix this, download Magento 126.96.36.199 and copy
lib/Unserialize/Parser.php lib/Unserialize/Reader/Arr.php lib/Unserialize/Reader/ArrValue.php lib/Unserialize/Reader/Null.php
files to your website. check if any changes between files.
Please take Security Patch SUPEE-10415 - Possible Issues? as reference.