Error message
Deprecated function: Creation of dynamic property Drupal\theme_per_user\Theme\ThemeSwitcher::$user_id is deprecated in Drupal\theme_per_user\Theme\ThemeSwitcher->applies() (line 82 of modules/contrib/theme_per_user/src/Theme/ThemeSwitcher.php).
Drupal\theme_per_user\Theme\ThemeSwitcher->applies() (Line: 67)
Drupal\Core\Theme\ThemeNegotiator->determineActiveTheme() (Line: 414)
Drupal\Core\Theme\ThemeManager->initTheme() (Line: 95)
Drupal\Core\Theme\ThemeManager->getActiveTheme() (Line: 230)
Drupal\Core\Theme\Registry->init() (Line: 317)
Drupal\Core\Theme\Registry->getRuntime() (Line: 194)
Drupal\Core\Entity\EntityViewBuilder->getBuildDefaults() (Line: 61)
Drupal\node\NodeViewBuilder->getBuildDefaults() (Line: 157)
Drupal\Core\Entity\EntityViewBuilder->viewMultiple() (Line: 123)
Drupal\Core\Entity\EntityViewBuilder->view() (Line: 134)
Drupal\Core\Entity\Controller\EntityViewController->view() (Line: 66)
Drupal\node\Controller\NodeViewController->view()
call_user_func_array() (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 637)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 121)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext() (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 181)
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)