Deprecated function: strpos(): Passing null to parameter #1 ($haystack) of type string is deprecated in
Drupal\webform\Theme\WebformThemeNegotiator->getActiveTheme() (line
79 of
modules/webform/src/Theme/WebformThemeNegotiator.php).
Drupal\webform\Theme\WebformThemeNegotiator->getActiveTheme(Object) (Line: 58)
Drupal\webform\Theme\WebformThemeNegotiator->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: 43)
Drupal\Core\Cache\Context\ThemeCacheContext->getContext(NULL) (Line: 118)
Drupal\Core\Cache\Context\CacheContextsManager->convertTokensToKeys(Array) (Line: 317)
Drupal\Core\Render\RenderCache->createCacheID(Array) (Line: 66)
Drupal\Core\Render\RenderCache->get(Array) (Line: 109)
Drupal\Core\Render\PlaceholderingRenderCache->get(Array) (Line: 77)
Drupal\Core\Render\RenderCache->get(Array) (Line: 109)
Drupal\Core\Render\PlaceholderingRenderCache->get(Array) (Line: 137)
Drupal\dynamic_page_cache\EventSubscriber\DynamicPageCacheSubscriber->onRequest(Object, 'kernel.request', Object)
call_user_func(Array, Object, 'kernel.request', Object) (Line: 142)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.request') (Line: 135)
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, '/node/155', 404) (Line: 119)
Drupal\Core\EventSubscriber\CustomPageExceptionHtmlSubscriber->makeSubrequestToCustomPath(Object, '/node/155', 404) (Line: 81)
Drupal\Core\EventSubscriber\CustomPageExceptionHtmlSubscriber->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: 219)
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: 709)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)