Undefined array key "simple_sku" in GetSkuFromOrderItem plugin when order item options are incomplete

[fvlasie]

Preconditions and environment

Magento ver. 2.4.7-p6

The plugin Magento\InventoryConfigurableProduct\Plugin\Sales\GetSkuFromOrderItem assumes that the 'simple_sku' key is always present in the $orderItem->getProductOptions() array. In some cases (e.g. custom order creation, API orders, or legacy data), this key may be missing, resulting in a PHP warning.

Steps to reproduce

1. Place or import an order for a configurable product where simple_sku is not set in the order item options.
2. Trigger any process that calls GetSkuFromOrderItem::aroundExecute() (e.g. indexing, order view, or POS sync).
3. Observe the PHP warning in logs or frontend.

Expected result

Magento should safely fall back to $orderItem->getSku() if simple_sku is not set.

Actual result

Error message "Undefined array key "simple_sku" in vendor/magento/module-inventory-configurable-product/Plugin/Sales/GetSkuFromOrderItem.php on line 36"

Additional information

Suggested Fix
Replace:

$sku = $orderItemOptions['simple_sku'];

With:
$sku = $orderItemOptions['simple_sku'] ?? $orderItem->getSku();

This ensures compatibility with orders that may not include the simple_sku key.

Release note

No response

Triage and priority

• Severity: S0 - Affects critical data or functionality and leaves users without workaround.
• 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]

Hi @fvlasie. Thank you for your report.
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[m2-assistant]

Hi @engcom-Bravo. Thank you for working on this issue.
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[engcom-Bravo]

Hi @fvlasie,

Thanks for your reporting and collaboration.

We have tried to reproduce the issue in Latest 2.4-develop instance and we are unable to proceed further.Could you please elaborate the step 1

Place or import an order for a configurable product where simple_sku is not set in the order item options.

Thanks.

[fvlasie]

It is difficult to reproduce because the error only shows for some products so it cannot be reproduced consistently. However, the suggested fix did solve the problem in my case (admin was unable to create a Credit Memo). The fix is a simple failsafe that should not introduce new errors but solves this obscure edge case. I highly recommend including it in the standard codebase.

[engcom-Bravo]

Hi @fvlasie,

Thanks for your Update.

As per the process the issue should be confirmed in the Latest 2.4-develop instance hence could you please elaborate the steps to reproduce if possible please provide screenshots or screencast it will help us to proceed further.

Thanks.