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Error: Call to a member function getName() on null in Drupal\lang_dropdown\Form\LanguageDropdownForm->buildForm() (line 229 of modules/contrib/lang_dropdown/src/Form/LanguageDropdownForm.php).
call_user_func_array() (Line: 536) Drupal\Core\Form\FormBuilder->retrieveForm() (Line: 283) Drupal\Core\Form\FormBuilder->buildForm() (Line: 224) Drupal\Core\Form\FormBuilder->getForm() (Line: 762) Drupal\lang_dropdown\Plugin\Block\LanguageDropdownBlock->build() (Line: 171) Drupal\block\BlockViewBuilder::preRender() call_user_func_array() (Line: 111) Drupal\Core\Render\Renderer->doTrustedCallback() (Line: 858) Drupal\Core\Render\Renderer->doCallback() (Line: 421) Drupal\Core\Render\Renderer->doRender() (Line: 493) Drupal\Core\Render\Renderer->doRender() (Line: 493) Drupal\Core\Render\Renderer->doRender() (Line: 240) Drupal\Core\Render\Renderer->render() (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter() (Line: 52) __TwigTemplate_2bc63651e94d22ac5dd6ef8b099815f3->doDisplay() (Line: 394) Twig\Template->displayWithErrorHandling() (Line: 367) Twig\Template->display() (Line: 379) Twig\Template->render() (Line: 38) Twig\TemplateWrapper->render() (Line: 39) twig_render_template() (Line: 348) Drupal\Core\Theme\ThemeManager->render() (Line: 480) Drupal\Core\Render\Renderer->doRender() (Line: 493) Drupal\Core\Render\Renderer->doRender() (Line: 240) Drupal\Core\Render\Renderer->render() (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter() (Line: 44) __TwigTemplate_faae630301c26b3e75ff068d91ec5e22->doDisplay() (Line: 394) Twig\Template->displayWithErrorHandling() (Line: 367) Twig\Template->display() (Line: 379) Twig\Template->render() (Line: 38) Twig\TemplateWrapper->render() (Line: 39) twig_render_template() (Line: 348) Drupal\Core\Theme\ThemeManager->render() (Line: 480) Drupal\Core\Render\Renderer->doRender() (Line: 240) Drupal\Core\Render\Renderer->render() (Line: 475) Drupal\Core\Template\TwigExtension->escapeFilter() (Line: 171) __TwigTemplate_c5cbef33cb7650f43164dba3e23c211b->doDisplay() (Line: 394) Twig\Template->displayWithErrorHandling() (Line: 367) Twig\Template->display() (Line: 379) Twig\Template->render() (Line: 38) Twig\TemplateWrapper->render() (Line: 39) twig_render_template() (Line: 348) Drupal\Core\Theme\ThemeManager->render() (Line: 480) Drupal\Core\Render\Renderer->doRender() (Line: 240) Drupal\Core\Render\Renderer->render() (Line: 158) Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 627) Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 159) Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse() (Line: 90) Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray() call_user_func() (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 186) Symfony\Component\HttpKernel\HttpKernel->handleRaw() (Line: 76) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 58) 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: 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: 166) Drupal\Core\EventSubscriber\DefaultExceptionHtmlSubscriber->makeSubrequest() (Line: 119) Drupal\Core\EventSubscriber\CustomPageExceptionHtmlSubscriber->makeSubrequestToCustomPath() (Line: 81) Drupal\Core\EventSubscriber\CustomPageExceptionHtmlSubscriber->on404() (Line: 109) Drupal\Core\EventSubscriber\HttpExceptionSubscriberBase->onException() call_user_func() (Line: 111) Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch() (Line: 239) Symfony\Component\HttpKernel\HttpKernel->handleThrowable() (Line: 91) Symfony\Component\HttpKernel\HttpKernel->handle() (Line: 58) 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: 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: 704) Drupal\Core\DrupalKernel->handle() (Line: 19)