Error Cannot return null for non-nullable field "SelectedShippingMethod.carrier_code"

[ThomasHWeb]

Preconditions and environment

• Magento 2.4.7
• In my production environment, I watched this error message in logs after upgrading to Magento 2.4.7. It triggers because of the changes made in vendor/magento/module-quote-graph-ql/Model/Resolver/ShippingAddress/SelectedShippingMethod.php related to this commit #36606.

Somehow, the shipping method from address has not been reset before, and the rate associate is not in the rates list. $carrierCode and $methodCode variables remain null after the foreach block.

Steps to reproduce

Not able to reproduce it in my local environment. It seems to be a very tricky use case.

Expected result

To not have selected address if last shipping method saved not matched with the new rates list.

Actual result

Cart GraphQL data are not returned in storefront because of this error.

Additional information

No response

Release note

No response

Triage and priority

• [ ] Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• [X] Severity: S1 - Affects critical data or functionality and forces users to employ a workaround.
• [ ] Severity: S2 - Affects non-critical data or functionality and forces users to employ a workaround.
• [ ] Severity: S3 - Affects non-critical data or functionality and does not force users to employ a workaround.
• [ ] Severity: S4 - Affects aesthetics, professional look and feel, “quality” or “usability”.

[m2-assistant[bot]]

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[engcom-Delta]

Hi @ThomasHWeb ,

Thanks for reporting and collaboration.

Verified the issue in magento 2.4.7 instance and the issue is not reproducible.

Steps to reproduce:-

1.Send a Graphql query and verify

query { cart(cart_id: "<cart_id>") { shipping_addresses { selected_shipping_method { carrier_code method_code } available_shipping_methods { carrier_code method_code } } } }

We are not getting any error while sending the graphql query,

Please add some more details with screenshots to debug this issue.

Thanks,

[engcom-Delta]

Hi @ThomasHWeb ,

Awaiting your reply to move further on this issue.

Thanks,

[engcom-Delta]

Hello @ThomasHWeb ,

As there is no activity on this issue for a long time, we believe the issue has been resolved, hence closing this issue. Feel free to raise a new issue or reopen this if you still face it.

Thank you.

[owandrejavidovic]

The issue is mutation { setShippingMethodsOnCart( input: { cart_id: "walNToYaEaFeN4QKFoQwz9hlChT124Gn" owNewsletterSubscribe: false shipping_methods: [{ carrier_code : "your_method" method_code : "your_method" }] } ) { cart { email id is_virtual owNewsletterSubscribe shipping_addresses { selected_shipping_method{ carrier_code carrier_title } street telephone uid } total_quantity } } }

Response: { "data": { "setShippingMethodsOnCart": { "cart": { "email": "[email protected]", "id": "fPM15smAU0qoOacz8LT7XlfXEenvTT9p", "is_virtual": false, "owNewsletterSubscribe": false, "shipping_addresses": [ { "selected_shipping_method": null, // this is the issue "street": [ "Pod kostanji 8" ], "telephone": "041676376", "uid": 233034 } ], "total_quantity": 1 } } } }

[m08110071]

Steps to reproduce:

• Enable Free Shipping method
• Create new cart and add any product to cart
• Call API to set Fee Shipping as delivery method
• Disable Free Shipping method
• Call API get cart detail (request fields include shipping_address.selected_shipping_method.carrier_code)