diff --git a/modules/lightning_features/lightning_media/src/Plugin/Field/FieldWidget/EntityReferenceBrowserWidget.php b/modules/lightning_features/lightning_media/src/Plugin/Field/FieldWidget/EntityReferenceBrowserWidget.php
index 3efb8b27e..62da83570 100644
--- a/modules/lightning_features/lightning_media/src/Plugin/Field/FieldWidget/EntityReferenceBrowserWidget.php
+++ b/modules/lightning_features/lightning_media/src/Plugin/Field/FieldWidget/EntityReferenceBrowserWidget.php
@@ -18,8 +18,10 @@ public function formElement(FieldItemListInterface $items, $delta, array $elemen
     $element = parent::formElement($items, $delta, $element, $form, $form_state);
 
     // Move the remaining number of selections to the details summary.
-    $element['#description'] .= $element['current']['#prefix'];
-    unset($element['current']['#prefix']);
+    if (isset($element['current']['#prefix'])) {
+      $element['#description'] .= $element['current']['#prefix'];
+      unset($element['current']['#prefix']);
+    }
 
     // Wrap the current selections in a nice <details> element.
     $cardinality = $this->fieldDefinition