Error message

Notice: Undefined index: display in view_mode_page_entity_view_mode_alter() (line 46 of modules/view_mode_page/view_mode_page.module).
view_mode_page_entity_view_mode_alter('full', Object, Array) (Line: 539)
Drupal\Core\Extension\ModuleHandler->alter('entity_view_mode', 'full', Object, Array) (Line: 183)
Drupal\Core\Entity\EntityViewBuilder->getBuildDefaults(Object, 'full') (Line: 36)
Drupal\block_content\BlockContentViewBuilder->getBuildDefaults(Object, 'full') (Line: 160)
Drupal\Core\Entity\EntityViewBuilder->viewMultiple(Array, 'full', NULL) (Line: 24)
Drupal\block_content\BlockContentViewBuilder->viewMultiple(Array, 'full', NULL) (Line: 17)
Drupal\block_content\BlockContentViewBuilder->view(Object, 'full') (Line: 187)
Drupal\block_content\Plugin\Block\BlockContentBlock->build() (Line: 163)
Drupal\block\BlockViewBuilder::preRender(Array)
call_user_func('Drupal\block\BlockViewBuilder::preRender', Array) (Line: 378)
Drupal\Core\Render\Renderer->doRender(Array) (Line: 450)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 177)
__TwigTemplate_c7caacb6b5c018fe7ff8ea7839677c4ba0daed98143f1c15d3b2858dfa4f34c1->doDisplay(Array, Array) (Line: 443)
Twig\Template->displayWithErrorHandling(Array, Array) (Line: 414)
Twig\Template->display(Array) (Line: 422)
Twig\Template->render(Array) (Line: 64)
twig_render_template('themes/wisski/halfpastthreegrain/templates/page.html.twig', Array) (Line: 384)
Drupal\Core\Theme\ThemeManager->render('page', Array) (Line: 437)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array) (Line: 501)
Drupal\Core\Template\TwigExtension->escapeFilter(Object, Array, 'html', NULL, 1) (Line: 102)
__TwigTemplate_b502489965c068acc252428105319d89e97e1fdc79d495938bb68d656c52ce5b->doDisplay(Array, Array) (Line: 443)
Twig\Template->displayWithErrorHandling(Array, Array) (Line: 414)
Twig\Template->display(Array) (Line: 422)
Twig\Template->render(Array) (Line: 64)
twig_render_template('core/themes/classy/templates/layout/html.html.twig', Array) (Line: 384)
Drupal\Core\Theme\ThemeManager->render('html', Array) (Line: 437)
Drupal\Core\Render\Renderer->doRender(Array, ) (Line: 195)
Drupal\Core\Render\Renderer->render(Array) (Line: 147)
Drupal\Core\Render\MainContent\HtmlRenderer->Drupal\Core\Render\MainContent\{closure}() (Line: 582)
Drupal\Core\Render\Renderer->executeInRenderContext(Object, Object) (Line: 148)
Drupal\Core\Render\MainContent\HtmlRenderer->renderResponse(Array, Object, Object) (Line: 90)
Drupal\Core\EventSubscriber\MainContentViewSubscriber->onViewRenderArray(Object, 'kernel.view', Object)
call_user_func(Array, Object, 'kernel.view', Object) (Line: 111)
Drupal\Component\EventDispatcher\ContainerAwareEventDispatcher->dispatch('kernel.view', Object) (Line: 156)
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: 106)
Drupal\page_cache\StackMiddleware\PageCache->pass(Object, 1, 1) (Line: 85)
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: 693)
Drupal\Core\DrupalKernel->handle(Object) (Line: 19)