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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). 
Drupal\lang_dropdown\Form\LanguageDropdownForm->buildForm()
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: 788)
Drupal\Core\Render\Renderer->doCallback() (Line: 377)
Drupal\Core\Render\Renderer->doRender() (Line: 204)
Drupal\Core\Render\Renderer->render() (Line: 160)
Drupal\Core\Render\Renderer->Drupal\Core\Render\{closure}() (Line: 583)
Drupal\Core\Render\Renderer->executeInRenderContext() (Line: 161)
Drupal\Core\Render\Renderer->renderPlain() (Line: 175)
Drupal\Core\Render\Renderer->renderPlaceholder() (Line: 693)
Drupal\big_pipe\Render\BigPipe->renderPlaceholder() (Line: 547)
Drupal\big_pipe\Render\BigPipe->sendPlaceholders() (Line: 305)
Drupal\big_pipe\Render\BigPipe->sendContent() (Line: 112)
Drupal\big_pipe\Render\BigPipeResponse->sendContent() (Line: 423)
Symfony\Component\HttpFoundation\Response->send() (Line: 20)