admin/commerce/referral Call to a member function label() on null

Problem/Motivation

On the referrals admin listing, the page can fatally error when a referral has not yet been redeemed and therefore has no referee_user assigned.

In normal module behavior, a referral entity is created as soon as a user visits /user/referral and a referral code is generated. At that point, the referral has a referrer_user and referral_coupon, but referee_user is still empty until another customer actually uses the code on an order.

However, Drupal\commerce_referral\Entity\ReferralListBuilder::buildRow() assumes referee_user is always present and calls label() / toUrl() on a null entity, which crashes the admin page.

Observed error:

Error: Call to a member function label() on null in Drupal\commerce_referral\Entity\ReferralListBuilder->buildRow()

Steps to reproduce

• Enable Commerce Referral and configure a valid referral type with a referral promotion.
• Grant a user permission to access their referral page.
• Log in as that user and visit /user/referral so a referral code is generated.
• Before any other user redeems that code, visit the referrals admin listing.
• The listing attempts to render the row for the new referral.

Proposed resolution

Update ReferralListBuilder::buildRow() to safely handle empty or missing user references.

Remaining tasks

None

User interface changes

The referrals admin listing would show a safe fallback label such as “Not assigned” for referrals that have not yet been redeemed, instead of crashing.

API changes

None

Data model changes

None