Undefined Index notice using horizontal tabs

Hey guys,

I am getting the following notice after integrating a field group using horizontal tabs on node edit. Maybe somebody could have a look. Everything is working as expected, so the notice seems to have no effect on functionality.

Thanks in advance!

Notice: Undefined index: #wrapper_element in field_group_theme_suggestions_alter() (line 86 of modules/field_group/field_group.module).
field_group_theme_suggestions_alter(Array, Array, 'horizontal_tabs') (Line: 501)
Drupal\Core\Extension\ModuleHandler->alter(Array, Array, Array, 'horizontal_tabs') (Line: 244)
Drupal\Core\Theme\ThemeManager->render('horizontal_tabs', Array) (Line: 491)
Drupal\Core\Render\Renderer->doRender(Array) (Line: 448)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array) (Line: 468)
Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 47)
__TwigTemplate_de3e86e64ae924912717b63a39d14df64b17a2c035a954cea0f8c6b4b78fd9f7->doDisplay(Array, Array) (Line: 382)
Twig_Template->displayWithErrorHandling(Array, Array) (Line: 350)
Twig_Template->display(Array) (Line: 361)
Twig_Template->render(Array) (Line: 64)
twig_render_template('core/themes/classy/templates/content-edit/node-edit-form.html.twig', Array) (Line: 384)
Drupal\Core\Theme\ThemeManager->render(Array, Array) (Line: 435)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array, ) (Line: 226)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 574)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 227)
Drupal\Core\Render\MainContent\HtmlRenderer->prepare(Array, Object, Object) (Line: 117)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 149)
Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object, 1) (Line: 64)
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: 50)
Drupal\Core\StackMiddleware\NegotiationMiddleware->handle(Object, 1, 1) (Line: 23)
Stack\StackedHttpKernel->handle(Object, 1, 1) (Line: 652)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)