"Shipping address is not set" exception in Multishipping Checkout.

[p-bystritsky]

Preconditions

1. Magento 2.
2. Multishipping Checkout enabled (by default)
3. Simple Product.
4. Customer.

Steps to reproduce

1. Log In as Customer.
2. Add Product to Cart.
3. Proceed to Checkout.
4. Fill Shipping Address data, click Next (do not place Order)
5. Return to the Storefront.
6. Go to the Shopping Cart.
7. Click Check Out with Multiple Addresses.

Expected result

1. Correct Multishipping Checkout workflow.

Actual result

1. Exception #0 (Magento\Framework\Exception\StateException): Shipping address is not set
2. Exception #0 (Zend_Db_Statement_Exception): SQLSTATE[23000]: Integrity constraint violation when trying to access Shopping Cart.

[magento-engcom-team]

Hi @p-bystritsky. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

• Summary of the issue
• Information on your environment
• Steps to reproduce
• Expected and actual results

Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me {$VERSION} instance

where {$VERSION} is version tags (starting from 2.2.0+) or develop branches (2.2-develop +).
For more details, please, review the Magento Contributor Assistant documentation.

@p-bystritsky do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

We've acknowledged the issue and added to our backlog.

[dmytro-ch]

I will handle this issue.