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TypeError: preg_match(): Argument #2 ($subject) must be of type string, null given in preg_match() (line 19 of themes/custom/kimbell/hooks/preprocess/html.inc.php).
preg_match('/^system\.40\d$/', NULL) (Line: 19) kimbell_preprocess_html(Array, 'html', Array) call_user_func_array('kimbell_preprocess_html', Array) (Line: 285) Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 445) Drupal\Core\Render\Renderer->doRender(Array, 1) (Line: 204) Drupal\Core\Render\Renderer->render(Array, 1) (Line: 148) Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 592) Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 149) Drupal\Core\Render\Renderer->renderRoot(Array) (Line: 66) Drupal\Core\Render\BareHtmlPageRenderer->renderBarePage(Array, Object, 'maintenance_page', Array) (Line: 76) Drupal\Core\ProxyClass\Render\BareHtmlPageRenderer->renderBarePage(Array, Object, 'maintenance_page') (Line: 164) Drupal\Core\EventSubscriber\MaintenanceModeSubscriber->onMaintenanceModeRequest(Object, 'site.maintenance_mode_request', Object) call_user_func(Array, Object, 'site.maintenance_mode_request', Object) (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'site.maintenance_mode_request') (Line: 123) Drupal\Core\EventSubscriber\MaintenanceModeSubscriber->onKernelRequestMaintenance(Object, 'kernel.exception', Object) call_user_func(Array, Object, 'kernel.exception', Object) (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch(Object, 'kernel.exception') (Line: 239) Symfony\Component\HttpKernel\HttpKernel->handleThrowable(Object, Object, 1) (Line: 91) 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: 51) Drupal\Core\StackMiddleware\StackedHttpKernel->handle(Object, 1, 1) (Line: 704) Drupal\Core\DrupalKernel->handle(Object) (Line: 19)