Error message

• Warning: Undefined array key 0 in cmlight_preprocess_node() (line 648 of themes/custom/cmlight/cmlight.theme).

  cmlight_preprocess_node(Array, 'node', Array)
  call_user_func_array('cmlight_preprocess_node', Array) (Line: 287)
  Drupal\Core\Theme\ThemeManager->render('node', Array) (Line: 433)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 204)
  Drupal\Core\Render\Renderer->render(Array, ) (Line: 242)
  Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 580)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 243)
  Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 132)
  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: 174)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
  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: 49)
  Asm89\Stack\Cors->handle(Object, 1, 1) (Line: 263)
  Drupal\shield\ShieldMiddleware->bypass(Object, 1, 1) (Line: 130)
  Drupal\shield\ShieldMiddleware->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 116)
  Drupal\cloudflare\CloudFlareMiddleware->handle(Object, 1, 1) (Line: 51)
  Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
  Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)
  Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
  

• Warning: Trying to access array offset on value of type null in cmlight_preprocess_node() (line 648 of themes/custom/cmlight/cmlight.theme).

  cmlight_preprocess_node(Array, 'node', Array)
  call_user_func_array('cmlight_preprocess_node', Array) (Line: 287)
  Drupal\Core\Theme\ThemeManager->render('node', Array) (Line: 433)
  Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 204)
  Drupal\Core\Render\Renderer->render(Array, ) (Line: 242)
  Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 580)
  Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 243)
  Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 132)
  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: 174)
  Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 81)
  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: 49)
  Asm89\Stack\Cors->handle(Object, 1, 1) (Line: 263)
  Drupal\shield\ShieldMiddleware->bypass(Object, 1, 1) (Line: 130)
  Drupal\shield\ShieldMiddleware->handle(Object, 1, 1) (Line: 48)
  Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 116)
  Drupal\cloudflare\CloudFlareMiddleware->handle(Object, 1, 1) (Line: 51)
  Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
  Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 718)
  Drupal\Core\DrupalKernel->handle(Object) (Line: 19)