diff --git a/src/Entity/FacetSource.php b/src/Entity/FacetSource.php
index 6fd3ec3..e90a619 100644
--- a/src/Entity/FacetSource.php
+++ b/src/Entity/FacetSource.php
@@ -137,7 +137,12 @@ class FacetSource extends ConfigEntityBase implements FacetSourceInterface {
       ->getStorage('facets_facet');
 
     $id = explode('__', $this->id(), 2);
-    $id = $id[0] . ':' . $id[1];
+    if (count($id) == 2) {
+      $id = $id[0] . ':' . $id[1];
+    }
+    else {
+      $id = $id[0];
+    }
     $facet_ids = $entityStorage
       ->getQuery()
       ->condition('facet_source_id', $id)