Notice: Undefined index: menu_fieldset CheeseburgerMenu->blockSubmit()

Hi getting some errors on the submit of the block and it's not showing on the site.

Notice: Undefined index: menu_fieldset in Drupal\cheeseburger_menu\Plugin\Block\CheeseburgerMenu->blockSubmit() (line 537 of modules/contrib/cheeseburger_menu/src/Plugin/Block/CheeseburgerMenu.php).
Drupal\cheeseburger_menu\Plugin\Block\CheeseburgerMenu->blockSubmit(Array, Object) (Line: 229)
Drupal\Core\Block\BlockBase->submitConfigurationForm(Array, Object) (Line: 643)
Drupal\context\Plugin\ContextReaction\Blocks->submitConfigurationForm(Array, Object) (Line: 186)
Drupal\context_ui\Form\ContextFormBase->handleReactions(Array, Object) (Line: 127)
Drupal\context_ui\Form\ContextFormBase->submitForm(Array, Object)
call_user_func_array(Array, Array) (Line: 111)
Drupal\Core\Form\FormSubmitter->executeSubmitHandlers(Array, Object) (Line: 51)
Drupal\Core\Form\FormSubmitter->doSubmitForm(Array, Object) (Line: 589)
Drupal\Core\Form\FormBuilder->processForm('context_edit_form', Array, Object) (Line: 318)
Drupal\Core\Form\FormBuilder->buildForm('context_edit_form', Object) (Line: 93)
Drupal\Core\Controller\FormController->getContentResult(Object, Object)
call_user_func_array(Array, Array) (Line: 123)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 582)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 124)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->wrapControllerExecutionInRenderContext(Array, Array) (Line: 97)
Drupal\Core\EventSubscriber\EarlyRenderingControllerWrapperSubscriber->Drupal\Core\EventSubscriber\{closure}() (Line: 151)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 68)
Symfony\Component\HttpKernel\HttpKernel->handle(Object, 1, 1) (Line: 57)
Drupal\Core\StackMiddleware\Session->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\KernelPreHandle->handle(Object, 1, 1) (Line: 99)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 78)
Drupal\page_cache\StackMiddleware\PageCache->handle(Object, 1, 1) (Line: 47)
Drupal\Core\StackMiddleware\ReverseProxyMiddleware->handle(Object, 1, 1) (Line: 52)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 669)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)