Problem/Motivation
It is no possible to delete a group
Steps to reproduce
Got to admin/group and choose and choose the operation "delete". In the next step you will be ask if you want to delete this group. Click on "delete". Following error message is displayed:
Error: Call to a member function getContentPlugin() on null in Drupal\group\Entity\GroupContent->getContentPlugin() (line 107 of modules\contrib\group\src\Entity\GroupContent.php).
Drupal\group\Entity\GroupContent->getContentPlugin() (Line: 143)
Drupal\group\Entity\GroupContent->urlRouteParameters('add-form') (Line: 205)
Drupal\Core\Entity\EntityBase->toUrl('add-form') (Line: 347)
Drupal\Core\Entity\EntityBase->Drupal\Core\Entity\{closure}('add-form')
array_filter(Array, Object) (Line: 356)
Drupal\Core\Entity\EntityBase->uriRelationships() (Line: 105)
menu_link_content_entity_predelete(Object)
call_user_func_array('menu_link_content_entity_predelete', Array) (Line: 403)
Drupal\Core\Extension\ModuleHandler->invokeAll('entity_predelete', Array) (Line: 206)
Drupal\Core\Entity\EntityStorageBase->invokeHook('predelete', Object) (Line: 843)
Drupal\Core\Entity\ContentEntityStorageBase->invokeHook('predelete', Object) (Line: 424)
Drupal\Core\Entity\EntityStorageBase->delete(Array) (Line: 786)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->delete(Array) (Line: 403)
Drupal\Core\Entity\EntityBase->delete() (Line: 299)
Drupal\group\Entity\Group::preDelete(Object, Array) (Line: 422)
Drupal\Core\Entity\EntityStorageBase->delete(Array) (Line: 786)
Drupal\Core\Entity\Sql\SqlContentEntityStorage->delete(Array) (Line: 403)
Drupal\Core\Entity\EntityBase->delete() (Line: 40)
Drupal\group\Entity\Form\GroupDeleteForm->submitForm(Array, Object)
call_user_func_array(Array, Array) (Line: 114)
Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 52)
Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 593)
Drupal\Core\Form\FormBuilder->processForm('group_department_delete_form', Array, Object) (Line: 321)
Drupal\Core\Form\FormBuilder->buildForm(Object, Object) (Line: 91)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 573)
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: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
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: 708)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)