diff --git a/src/Plugin/views/row/Calendar.php b/src/Plugin/views/row/Calendar.php
index 4c0a9eb..85413a8 100644
--- a/src/Plugin/views/row/Calendar.php
+++ b/src/Plugin/views/row/Calendar.php
@@ -393,6 +393,7 @@ class Calendar extends RowPluginBase {
     /** @var \Drupal\calendar\CalendarDateInfo $dateInfo */
     $dateInfo = $this->dateArgument->view->dateInfo;
     $id = $row->_entity->id();
+    $rows = [];
 
     if (!is_numeric($id)) {
       return [];