diff --git a/src/Form/FacetForm.php b/src/Form/FacetForm.php
index 1eaf72e..0c8218c 100644
--- a/src/Form/FacetForm.php
+++ b/src/Form/FacetForm.php
@@ -29,7 +29,7 @@ class FacetForm extends EntityForm {
    *
    * @var \Drupal\facets\FacetInterface
    */
-  protected $facet;
+  protected $entity;
 
   /**
    * The processor manager.
@@ -61,12 +61,14 @@ class FacetForm extends EntityForm {
    *   The processor plugin manager.
    * @param \Drupal\facets\Widget\WidgetPluginManager $widget_plugin_manager
    *   The plugin manager for widgets.
+   * @param \Drupal\facets\FacetSource\FacetSourcePluginManager $facet_source_plugin_manager
+   *   The plugin manager for facet sources.
    */
-  public function __construct(EntityTypeManagerInterface $entity_type_manager, ProcessorPluginManager $processor_plugin_manager, WidgetPluginManager $widget_plugin_manager, FacetSourcePluginManager $facetSourcePluginManager) {
+  public function __construct(EntityTypeManagerInterface $entity_type_manager, ProcessorPluginManager $processor_plugin_manager, WidgetPluginManager $widget_plugin_manager, FacetSourcePluginManager $facet_source_plugin_manager) {
     $this->entityTypeManager = $entity_type_manager;
     $this->processorPluginManager = $processor_plugin_manager;
     $this->widgetPluginManager = $widget_plugin_manager;
-    $this->facetSourcePluginManager = $facetSourcePluginManager;
+    $this->facetSourcePluginManager = $facet_source_plugin_manager;
   }
 
   /**
@@ -134,12 +136,17 @@ class FacetForm extends EntityForm {
     /** @var \Drupal\facets\FacetInterface $facet */
     $facet = $this->entity;
 
+    $facet_sources = [];
     foreach ($this->facetSourcePluginManager->getDefinitions() as $facet_source_id => $definition) {
       $facet_sources[$definition['id']] = !empty($definition['label']) ? $definition['label'] : $facet_source_id;
     }
-    $form['facet_source'] = [
-      '#markup' => t('Facet source: %facet_source', ['%facet_source' => $facet_sources[$facet->getFacetSourceId()]]),
-    ];
+    if (isset($facet_sources[$facet->getFacetSourceId()])) {
+      $form['facet_source'] = [
+        '#type' => 'item',
+        '#title' => $this->t('Facet source'),
+        '#markup' => $facet_sources[$facet->getFacetSourceId()],
+      ];
+    }
 
     $widget_options = [];
     foreach ($this->widgetPluginManager->getDefinitions() as $widget_id => $definition) {