i made a custom field, widget and formatter and i get this error when ajax add more or saving the entity form.
How do i provide an entity that may not exist yet to the validator?
Error: Call to a member function isNew() on null in Drupal\Core\Entity\Plugin\Validation\Constraint\ValidReferenceConstraintValidator->validate() (line 74 of /var/www/html/core/lib/Drupal/Core/Entity/Plugin/Validation/Constraint/ValidReferenceConstraintValidator.php)
#0 /var/www/html/core/lib/Drupal/Core/TypedData/Validation/RecursiveContextualValidator.php(196): Drupal\Core\Entity\Plugin\Validation\Constraint\ValidReferenceConstraintValidator->validate()
#1 /var/www/html/core/lib/Drupal/Core/TypedData/Validation/RecursiveContextualValidator.php(148): Drupal\Core\TypedData\Validation\RecursiveContextualValidator->validateConstraints()
#2 /var/www/html/core/lib/Drupal/Core/TypedData/Validation/RecursiveContextualValidator.php(158): Drupal\Core\TypedData\Validation\RecursiveContextualValidator->validateNode()
#3 /var/www/html/core/lib/Drupal/Core/TypedData/Validation/RecursiveContextualValidator.php(100): Drupal\Core\TypedData\Validation\RecursiveContextualValidator->validateNode()
#4 /var/www/html/core/lib/Drupal/Core/TypedData/Validation/RecursiveValidator.php(90): Drupal\Core\TypedData\Validation\RecursiveContextualValidator->validate()
#5 /var/www/html/core/lib/Drupal/Core/TypedData/TypedData.php(132): Drupal\Core\TypedData\Validation\RecursiveValidator->validate()
#6 /var/www/html/core/lib/Drupal/Core/Entity/ContentEntityBase.php(489): Drupal\Core\TypedData\TypedData->validate()
#7 /var/www/html/core/lib/Drupal/Core/Entity/ContentEntityForm.php(188): Drupal\Core\Entity\ContentEntityBase->validate()
#8 [internal function]: Drupal\Core\Entity\ContentEntityForm->validateForm()
#9 /var/www/html/core/lib/Drupal/Core/Form/FormValidator.php(82): call_user_func_array()
#10 /var/www/html/core/lib/Drupal/Core/Form/FormValidator.php(273): Drupal\Core\Form\FormValidator->executeValidateHandlers()
#11 /var/www/html/core/lib/Drupal/Core/Form/FormValidator.php(118): Drupal\Core\Form\FormValidator->doValidateForm()
#12 /var/www/html/core/lib/Drupal/Core/Form/FormBuilder.php(589): Drupal\Core\Form\FormValidator->validateForm()
#13 /var/www/html/core/lib/Drupal/Core/Form/FormBuilder.php(321): Drupal\Core\Form\FormBuilder->processForm()
#14 /var/www/html/core/lib/Drupal/Core/Controller/FormController.php(73): Drupal\Core\Form\FormBuilder->buildForm()
#15 [internal function]: Drupal\Core\Controller\FormController->getContentResult()
#16 /var/www/html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array()
#17 /var/www/html/core/lib/Drupal/Core/Render/Renderer.php(573): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#18 /var/www/html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext()
#19 /var/www/html/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext()
#20 /var/www/html/vendor/symfony/http-kernel/HttpKernel.php(158): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#21 /var/www/html/vendor/symfony/http-kernel/HttpKernel.php(80): Symfony\Component\HttpKernel\HttpKernel->handleRaw()
#22 /var/www/html/core/lib/Drupal/Core/StackMiddleware/Session.php(57): Symfony\Component\HttpKernel\HttpKernel->handle()
#23 /var/www/html/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(47): Drupal\Core\StackMiddleware\Session->handle()
#24 /var/www/html/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\Core\StackMiddleware\KernelPreHandle->handle()
#25 /var/www/html/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass()
#26 /var/www/html/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(47): Drupal\page_cache\StackMiddleware\PageCache->handle()
#27 /var/www/html/modules/contrib/devel/webprofiler/src/StackMiddleware/WebprofilerMiddleware.php(38): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle()
#28 /var/www/html/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(52): Drupal\webprofiler\StackMiddleware\WebprofilerMiddleware->handle()
#29 /var/www/html/vendor/stack/builder/src/Stack/StackedHttpKernel.php(23): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle()
#30 /var/www/html/core/lib/Drupal/Core/DrupalKernel.php(705): Stack\StackedHttpKernel->handle()
#31 /var/www/html/index.php(19): Drupal\Core\DrupalKernel->handle()
#32 {main}
Closed: outdated
9.4
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
If your field is not a reference to another entity, check that your field ItemList class extends the FieldItemList and not the EntityReferenceFieldItemList.
Also, in the same class, check your computeValue() method to ensure that the createItem() method is called with the right value (eg not an object).