In this article we'll list links to different Magento2 github issues listing issues in different Magento 2 versions that affect checkout or Magento 2 related to checkout directly and are out of scope of our extension:

  • Exception in frontend: FastCGI sent in stderr: "PHP message: PHP Fatal error: Uncaught TypeError: Argument 1 passed to Magento\Quote\Model\Cart\Totals::setExtensionAttributes() must be an instance of Magento\Quote\Api\Data\TotalsExtensionInterface, instance of Magento\Quote\Api\Data\AddressExtension given ... https://github.com/magento/magento2/issues/12655
  • Excceptionin backend: Exception #0 (Exception): Notice: Array to string conversion in /.../vendor/magento/module-shipping/Model/Config/Source/Allmethods.php on line 61 ... https://github.com/magento/magento2/issues/13136