Crashing error when Taxonomy Vocabulary is not selected

[kylehuynh205]

In https://islandora.traefik.me/admin/config/access-control/islandora_group, the vocabulary selector is not selected, there is crashing error - white screen of death:

#0 /var/www/drupal/web/core/lib/Drupal/Core/Entity/EntityBase.php(352): Drupal\Core\Entity\Sql\SqlContentEntityStorage->save()
#1 /var/www/drupal/web/core/lib/Drupal/Core/Entity/EntityForm.php(293): Drupal\Core\Entity\EntityBase->save()
#2 /var/www/drupal/web/modules/contrib/group/src/Entity/Form/GroupForm.php(85): Drupal\Core\Entity\EntityForm->save()
#3 /var/www/drupal/web/modules/contrib/group/src/Entity/Form/GroupRelationshipForm.php(184): Drupal\group\Entity\Form\GroupForm->save()
#4 [internal function]: Drupal\group\Entity\Form\GroupRelationshipForm->complete()
#5 /var/www/drupal/web/core/lib/Drupal/Core/Form/FormSubmitter.php(129): call_user_func_array()
#6 /var/www/drupal/web/core/lib/Drupal/Core/Form/FormSubmitter.php(67): Drupal\Core\Form\FormSubmitter->executeSubmitHandlers()
#7 /var/www/drupal/web/core/lib/Drupal/Core/Form/FormBuilder.php(597): Drupal\Core\Form\FormSubmitter->doSubmitForm()
#8 /var/www/drupal/web/core/lib/Drupal/Core/Form/FormBuilder.php(325): Drupal\Core\Form\FormBuilder->processForm()
#9 /var/www/drupal/web/core/lib/Drupal/Core/Entity/EntityFormBuilder.php(48): Drupal\Core\Form\FormBuilder->buildForm()
#10 /var/www/drupal/web/modules/contrib/group/src/Entity/Controller/GroupController.php(129): Drupal\Core\Entity\EntityFormBuilder->getForm()
#11 [internal function]: Drupal\group\Entity\Controller\GroupController->addForm()
#12 /var/www/drupal/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(123): call_user_func_array()
#13 /var/www/drupal/web/core/lib/Drupal/Core/Render/Renderer.php(627): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#14 /var/www/drupal/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(124): Drupal\Core\Render\Renderer->executeInRenderContext()
#15 /var/www/drupal/web/core/lib/Drupal/Core/EventSubscriber/EarlyRenderingControllerWrapperSubscriber.php(97): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext()
#16 /var/www/drupal/vendor/symfony/http-kernel/HttpKernel.php(181): Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}()
#17 /var/www/drupal/vendor/symfony/http-kernel/HttpKernel.php(76): Symfony\Component\HttpKernel\HttpKernel->handleRaw()
#18 /var/www/drupal/web/core/lib/Drupal/Core/StackMiddleware/Session.php(58): Symfony\Component\HttpKernel\HttpKernel->handle()
#19 /var/www/drupal/web/core/lib/Drupal/Core/StackMiddleware/KernelPreHandle.php(48): Drupal\Core\StackMiddleware\Session->handle()
#20 /var/www/drupal/web/core/lib/Drupal/Core/StackMiddleware/ContentLength.php(28): Drupal\Core\StackMiddleware\KernelPreHandle->handle()
#21 /var/www/drupal/web/core/modules/big_pipe/src/StackMiddleware/ContentLength.php(32): Drupal\Core\StackMiddleware\ContentLength->handle()
#22 /var/www/drupal/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(106): Drupal\big_pipe\StackMiddleware\ContentLength->handle()
#23 /var/www/drupal/web/core/modules/page_cache/src/StackMiddleware/PageCache.php(85): Drupal\page_cache\StackMiddleware\PageCache->pass()
#24 /var/www/drupal/web/core/lib/Drupal/Core/StackMiddleware/ReverseProxyMiddleware.php(48): Drupal\page_cache\StackMiddleware\PageCache->handle()
#25 /var/www/drupal/web/core/lib/Drupal/Core/StackMiddleware/NegotiationMiddleware.php(51): Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle()
#26 /var/www/drupal/web/core/lib/Drupal/Core/StackMiddleware/AjaxPageState.php(36): Drupal\Core\StackMiddleware\NegotiationMiddleware->handle()
#27 /var/www/drupal/web/core/lib/Drupal/Core/StackMiddleware/StackedHttpKernel.php(51): Drupal\Core\StackMiddleware\AjaxPageState->handle()
#28 /var/www/drupal/web/core/lib/Drupal/Core/DrupalKernel.php(704): Drupal\Core\StackMiddleware\StackedHttpKernel->handle()
#29 /var/www/drupal/web/index.php(19): Drupal\Core\DrupalKernel->handle()
#30 {main}