Warning: Trying to access array offset on value of type bool in Drupal\akademie_book\AkademieBookManager->buildItems() (line 105 of modules/custom/akademie_book/src/AkademieBookManager.php).Drupal\akademie_book\AkademieBookManager->buildItems() (Line: 21) Drupal\akademie_book\AkademieBookManager->bookTreeOutput() (Line: 165) Drupal\akademie_book\ProxyClass\AkademieBookManager->bookTreeOutput() (Line: 175) Drupal\book\Plugin\Block\BookNavigationBlock->build() (Line: 171) Drupal\block\BlockViewBuilder::preRender() call_user_func_array() (Line: 113) Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 875) Drupal\Core\Render\Renderer->doCallback() (Line: 432) Drupal\Core\Render\Renderer->doRender() (Line: 248) Drupal\Core\Render\Renderer->render() (Line: 165) Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 638) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 166) Drupal\Core\Render\Renderer->renderInIsolation() (Line: 191) Drupal\Core\Render\Renderer->doRenderPlaceholder() (Line: 728) Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() Fiber->start() (Line: 736) Drupal\Core\Render\Renderer->replacePlaceholders() (Line: 608) Drupal\Core\Render\Renderer->doRender() (Line: 248) Drupal\Core\Render\Renderer->render() (Line: 153) Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 638) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 154) Drupal\Core\Render\Renderer->renderRoot() (Line: 288) Drupal\Core\Render\HtmlResponseAttachmentsProcessor->renderPlaceholders() (Line: 74) Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments() (Line: 45) Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond() call_user_func() (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 214) Symfony\Component\HttpKernel\HttpKernel->filterResponse() (Line: 202) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53) Drupal\Core\StackMiddleware\Session->handle() (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28) Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32) Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 201) Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 138) Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 87) Drupal\page_cache\StackMiddleware\PageCache->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: 741) Drupal\Core\DrupalKernel->handle() (Line: 19)
Drupal\akademie_book\AkademieBookManager->buildItems() (Line: 21) Drupal\akademie_book\AkademieBookManager->bookTreeOutput() (Line: 165) Drupal\akademie_book\ProxyClass\AkademieBookManager->bookTreeOutput() (Line: 175) Drupal\book\Plugin\Block\BookNavigationBlock->build() (Line: 171) Drupal\block\BlockViewBuilder::preRender() call_user_func_array() (Line: 113) Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 875) Drupal\Core\Render\Renderer->doCallback() (Line: 432) Drupal\Core\Render\Renderer->doRender() (Line: 248) Drupal\Core\Render\Renderer->render() (Line: 165) Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 638) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 166) Drupal\Core\Render\Renderer->renderInIsolation() (Line: 191) Drupal\Core\Render\Renderer->doRenderPlaceholder() (Line: 728) Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() Fiber->start() (Line: 736) Drupal\Core\Render\Renderer->replacePlaceholders() (Line: 608) Drupal\Core\Render\Renderer->doRender() (Line: 248) Drupal\Core\Render\Renderer->render() (Line: 153) Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 638) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 154) Drupal\Core\Render\Renderer->renderRoot() (Line: 288) Drupal\Core\Render\HtmlResponseAttachmentsProcessor->renderPlaceholders() (Line: 74) Drupal\big_pipe\Render\BigPipeResponseAttachmentsProcessor->processAttachments() (Line: 45) Drupal\Core\EventSubscriber\HtmlResponseSubscriber->onRespond() call_user_func() (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 214) Symfony\Component\HttpKernel\HttpKernel->filterResponse() (Line: 202) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 53) Drupal\Core\StackMiddleware\Session->handle() (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle() (Line: 28) Drupal\Core\StackMiddleware\ContentLength->handle() (Line: 32) Drupal\big_pipe\StackMiddleware\ContentLength->handle() (Line: 201) Drupal\page_cache\StackMiddleware\PageCache->fetch() (Line: 138) Drupal\page_cache\StackMiddleware\PageCache->lookup() (Line: 87) Drupal\page_cache\StackMiddleware\PageCache->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: 741) Drupal\Core\DrupalKernel->handle() (Line: 19)
