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Error: Call to a member function access() on null in book_node_view() (line 233 of core/modules/book/book.module).
call_user_func_array() (Line: 409) Drupal\Core\Extension\ModuleHandler->Drupal\Core\Extension\{closure}() (Line: 388) Drupal\Core\Extension\ModuleHandler->invokeAllWith() (Line: 408) Drupal\Core\Extension\ModuleHandler->invokeAll() (Line: 287) Drupal\Core\Entity\EntityViewBuilder->buildMultiple() (Line: 238) Drupal\Core\Entity\EntityViewBuilder->build() call_user_func_array() (Line: 111) Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 858) Drupal\Core\Render\Renderer->doCallback() (Line: 421) Drupal\Core\Render\Renderer->doRender() (Line: 240) Drupal\Core\Render\Renderer->render() (Line: 238) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 627) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 231) Drupal\Core\Render\MainContent\HtmlRenderer->prepare() (Line: 128) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse() (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray() call_user_func() (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 186) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 58) Drupal\Core\StackMiddleware\Session->handle() (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28) Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 191) Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 128) Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 82) Drupal\page_cache\StackMiddleware\PageCache->handle() (Line: 50) Drupal\ban\BanMiddleware->handle() (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle() (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle() (Line: 36) Drupal\Core\StackMiddleware\AjaxPageState->handle() (Line: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle() (Line: 704) Drupal\Core\DrupalKernel->handle() (Line: 19)