diff --git a/config/schema/page_manager.schema.yml b/config/schema/page_manager.schema.yml
index 1fe3464..e33aff4 100644
--- a/config/schema/page_manager.schema.yml
+++ b/config/schema/page_manager.schema.yml
@@ -131,6 +131,9 @@ display_variant.plugin.block_display:
     page_title:
       type: label
       label: 'Page title'
+    force_simplepage:
+      type: boolean
+      label: 'Force SimplePage variant'
 
 display_variant.plugin.http_status_code:
   type: display_variant.plugin
diff --git a/src/EventSubscriber/ForceSimplePageVariantSubscriber.php b/src/EventSubscriber/ForceSimplePageVariantSubscriber.php
index eb28be6..87ac9d9 100644
--- a/src/EventSubscriber/ForceSimplePageVariantSubscriber.php
+++ b/src/EventSubscriber/ForceSimplePageVariantSubscriber.php
@@ -33,7 +33,8 @@ class ForceSimplePageVariantSubscriber implements EventSubscriberInterface {
       $route = reset($routes);
 
       // Find the selected variant for this page.
-      if ($variant = $page->getVariant($route->getDefault('page_manager_page_variant'))) {
+      $variant_id = $route->getDefault('page_manager_page_variant');
+      if ($variant_id && $variant = $page->getVariant($variant_id)) {
         // Check to see if this variant is configured to disable blocks.
         $settings = $variant->get('variant_settings');
         if (isset($settings['force_simplepage']) && $settings['force_simplepage']) {