Error on user creation page

Problem/Motivation

I have a user with permission to one domain. This user creates another user. New user gets saved but it throws a warning shown below -

Warning: Invalid argument supplied for foreach() in Drupal\domain\DomainElementManager::submitEntityForm() (line 112 of modules/contrib/domain/domain/src/DomainElementManager.php).

Drupal\domain\DomainElementManager::submitEntityForm(Array, Object)
call_user_func_array('\Drupal\domain\DomainElementManager::submitEntityForm', Array) (Line: 111)
Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 51)
Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 589)
Drupal\Core\Form\FormBuilder->processForm('user_form', Array, Object) (Line: 318)
Drupal\Core\Form\FormBuilder->buildForm('user_form', Object) (Line: 93)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 582)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 151)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 669)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)

I believe this error is being shown for this user because it has access to one domain only. I tried checking the checkbox for that domain but got the same error.

Proposed resolution

I propose to check the $values variable if its an array before doing a foreach on it. I have tried that and it worked, therefore, attaching the patch here.

Remaining tasks

NA

User interface changes

NA

API changes

NA

Data model changes

NA

Release notes snippet

NA