Error message

• Warning: Attempt to read property "entity" on null in htc_subtheme_preprocess_page() (line 29 of themes/custom/htc_subtheme/htc_subtheme.theme).

  htc_subtheme_preprocess_page(Array, 'page', Array) (Line: 287)
  Drupal\Core\Theme\ThemeManager->render('page', Array) (Line: 422)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 479)
  Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 88)
  __TwigTemplate_55ee70bdc56ce91a873398adcca40f78658cb67ba80dcf02b1b6bdce36733b9a->doDisplay(Array, Array) (Line: 405)
  Twig\Template->displayWithErrorHandling(Array, Array) (Line: 378)
  Twig\Template->display(Array) (Line: 390)
  Twig\Template->render(Array) (Line: 55)
  twig_render_template('themes/custom/htc_subtheme/templates/html.html.twig', Array) (Line: 384)
  Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 422)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 162)
  Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 564)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 163)
  Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
  Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
  call_user_func(Array, Object, 'kernel.view', Object) (Line: 142)
  Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 163)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 80)
  Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
  Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 191)
  Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128)
  Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82)
  Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
  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)
  

• User warning: Handler node_new_comments tried to add additional_field comment_count but comment_entity_statistics could not be added! in Drupal\views\Plugin\views\field\FieldPluginBase->addAdditionalFields() (line 194 of core/modules/views/src/Plugin/views/field/FieldPluginBase.php).

  Drupal\views\Plugin\views\field\FieldPluginBase->addAdditionalFields() (Line: 132)
  Drupal\comment\Plugin\views\field\NodeNewComments->query() (Line: 1373)
  Drupal\views\ViewExecutable->_build('field') (Line: 1282)
  Drupal\views\ViewExecutable->build(NULL) (Line: 1391)
  Drupal\views\ViewExecutable->execute(NULL) (Line: 1454)
  Drupal\views\ViewExecutable->render() (Line: 131)
  Drupal\views\Plugin\views\display\Block->execute() (Line: 1630)
  Drupal\views\ViewExecutable->executeDisplay('block_1', Array) (Line: 81)
  Drupal\views\Element\View::preRenderViewElement(Array) (Line: 59)
  Drupal\views\Plugin\Block\ViewsBlock->build() (Line: 171)
  Drupal\block\BlockViewBuilder::preRender(Array)
  call_user_func_array(Array, Array) (Line: 101)
  Drupal\Core\Render\Renderer->doTrustedCallback(Array, Array, 'Render #pre_render callbacks must be methods of a class that implements \Drupal\Core\Security\TrustedCallbackInterface or be an anonymous function. The callback was %s. See https://www.drupal.org/node/2966725', 'exception', 'Drupal\Core\Render\Element\RenderCallbackInterface') (Line: 772)
  Drupal\Core\Render\Renderer->doCallback('#pre_render', Array, Array) (Line: 363)
  Drupal\Core\Render\Renderer->doRender(Array) (Line: 435)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 479)
  Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 83)
  __TwigTemplate_2adc2066b238b978af1f3148afc2fb23d867465d54158fb2fb0bdbe75d1984b9->doDisplay(Array, Array) (Line: 405)
  Twig\Template->displayWithErrorHandling(Array, Array) (Line: 378)
  Twig\Template->display(Array) (Line: 390)
  Twig\Template->render(Array) (Line: 55)
  twig_render_template('themes/custom/htc_subtheme/templates/page/content_type/page--article.html.twig', Array) (Line: 384)
  Drupal\Core\Theme\ThemeManager->render('page', Array) (Line: 422)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 479)
  Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 88)
  __TwigTemplate_55ee70bdc56ce91a873398adcca40f78658cb67ba80dcf02b1b6bdce36733b9a->doDisplay(Array, Array) (Line: 405)
  Twig\Template->displayWithErrorHandling(Array, Array) (Line: 378)
  Twig\Template->display(Array) (Line: 390)
  Twig\Template->render(Array) (Line: 55)
  twig_render_template('themes/custom/htc_subtheme/templates/html.html.twig', Array) (Line: 384)
  Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 422)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 201)
  Drupal\Core\Render\Renderer->render(Array) (Line: 162)
  Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 564)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 163)
  Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
  Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
  call_user_func(Array, Object, 'kernel.view', Object) (Line: 142)
  Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.view') (Line: 163)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 80)
  Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 58)
  Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 191)
  Drupal\page_cache\StackMiddleware\PageCache->fetch(Object, 1, 1) (Line: 128)
  Drupal\page_cache\StackMiddleware\PageCache->lookup(Object, 1, 1) (Line: 82)
  Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 51)
  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)