Fatal crash on WPGraphQL JWT login requests (6070)

[kultzow]

Describe the Bug

When attempting to use WPGraphQL JWT Authentication in Next.JS to log in to the site from http://localhost:3000, the plugin generates the following:

Fatal error: Uncaught TypeError: md5(): Argument #1 ($string) must be of type string, int given in /nas/content/live/magicproxi2stg/wp-content/plugins/woocommerce-paypal-payments/modules/ppcp-axo/services.php:69

Disabling the plugin allows for login authentication to proceed with no other changes.

To Reproduce

From a local Next.JS environment, attempt to authenticate to an installation with the plugin active, via Apollo/JWT/WPGraphQL.

Expected Behavior

GraphQL returns a response while plugin is active

Actual Behavior

GraphQL can not return a response due to server error

Environment

• WordPress Version - 6.9.4
• WooCommerce Version - 10.6.1
• Plugin Version - 3.4.1

Additional Details

System status

<!--If applicable, paste the system status here. Please ensure you redact or remove any identifying information. -->

[kultzow]

This would be fixed by changing line to:

$session_id = substr(md5((string) WC()->session->get_customer_unique_id()), 0, 16);