diff --color -ruN a/src/Plugin/Commerce/BankAccount.php b/src/Plugin/Commerce/BankAccount.php
--- a/src/Plugin/Commerce/BankAccount.php	2024-04-10 18:03:43
+++ b/src/Plugin/Commerce/BankAccount.php	2024-04-10 18:02:09
@@ -21,7 +21,7 @@
    */
   public function buildLabel(PaymentMethodInterface $payment_method) {
     $t_args = [
-      '@account_number' => substr(str_replace(' ', '', $payment_method->iban->value), -4),
+      '@account_number' => substr(str_replace(' ', '', $payment_method->iban->value ?? ''), -4),
     ];
 
     return $this->t('Bank account ending in @account_number', $t_args);