Issue #3357811 by bluegeek9, detroz: Error on the "Test LDAP User...

Issue #3357811 by bluegeek9, detroz: Error on the "Test LDAP User Functionality for a given user" interface

ldap_user/src/Form/LdapUserTestForm.php

@@ -189,8 +189,9 @@ final class LdapUserTestForm extends FormBase implements LdapUserAttributesInter
       ->loadByProperties(['name' => $username]);
     $existingAccount = $existingAccount ? reset($existingAccount) : FALSE;
     if ($existingAccount) {
+      $user_id = (int) $existingAccount->id();
       $results['user entity (before provisioning or syncing)'] = $existingAccount->toArray();
-      $results['User Authmap'] = $this->externalAuth->get($existingAccount->id(), 'ldap_user');
+      $results['User Authmap'] = $this->externalAuth->get($user_id, 'ldap_user');
     }
     else {
       $results['User Authmap'] = 'No authmaps available.  Authmaps only shown if user account exists beforehand';