--- a/src/Traits/ViewsBulkOperationsFormTrait.php
+++ b/src/Traits/ViewsBulkOperationsFormTrait.php
@@ -34,6 +34,11 @@
     // Get tempstore data.
     $form_data = $this->getTempstoreData($view_id, $display_id);

+    // Tempstore may be NULL if expired or page was refreshed.
+    if ($form_data === NULL) {
+      return [];
+    }
+
     // Get data needed for selected entities list.
     $this->addListData($form_data);