Error message
Deprecated function: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in Drupal\styleguide\Theme\StyleguideThemeNegotiator->applies() (line 60 of modules/contrib/styleguide/src/Theme/StyleguideThemeNegotiator.php).Drupal\styleguide\Theme\StyleguideThemeNegotiator->applies(Object) (Line: 67) Drupal\Core\Theme\ThemeNegotiator->determineActiveTheme(Object) (Line: 405) Drupal\Core\Theme\ThemeManager->initTheme(Object) (Line: 96) Drupal\Core\Theme\ThemeManager->getActiveTheme() (Line: 56) Drupal\block\BlockRepository->getVisibleBlocksPerRegion(Array) (Line: 137) Drupal\block\Plugin\DisplayVariant\BlockPageVariant->build() (Line: 274) 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, 2) (Line: 81) Symfony\Component\HttpKernel\HttpKernel->handle(Object, 2, 1) (Line: 58) Drupal\Core\StackMiddleware\Session->handle(Object, 2, 1) (Line: 48) Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 2, 1) (Line: 106) Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 2, 1) (Line: 85) Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 2, 1) (Line: 48) Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 2, 1) (Line: 51) Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 2, 1) (Line: 23) Stack\StackedHttpKernel->handle(Object, 2) (Line: 166) Drupal\Core\EventSubscriber\DefaultExceptionHtmlSubscriber->makeSubrequest(Object, '/system/404', 404) (Line: 122) Drupal\Core\EventSubscriber\DefaultExceptionHtmlSubscriber->on404(Object) (Line: 109) Drupal\Core\EventSubscriber\HttpExceptionSubscriberBase->onException(Object, 'kernel.exception', Object) call_user_func(Array, Object, 'kernel.exception', Object) (Line: 142) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.exception') (Line: 229) Symfony\Component\HttpKernel\HttpKernel->handleThrowable(Object, Object, 1) (Line: 92) 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: 718) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)
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