diff --git a/includes/date_ical_plugin_row_ical_fields.inc b/includes/date_ical_plugin_row_ical_fields.inc
index e4a22c8..8d4a6ed 100644
--- a/includes/date_ical_plugin_row_ical_fields.inc
+++ b/includes/date_ical_plugin_row_ical_fields.inc
@@ -164,8 +164,10 @@ class date_ical_plugin_row_ical_fields extends views_plugin_row {
     // Create the event by starting with the date array from this row.
     $event = $date;
 
-    $entity = $row->_field_data[$this->view->base_field]['entity'];
-    $entity_type = $row->_field_data[$this->view->base_field]['entity_type'];
+    $entity = isset($row->_field_data[$this->view->base_field]['entity']) ?
+      $row->_field_data[$this->view->base_field]['entity'] : FALSE;
+    $entity_type = isset($row->_field_data[$this->view->base_field]['entity_type']) ?
+      $row->_field_data[$this->view->base_field]['entity_type'] : FALSE;
     // Add the CREATED, LAST-MODIFIED, and URL components based on the entity.
     // According to the iCal standard, CREATED and LAST-MODIFIED must be UTC.
     // Fortunately, Drupal stores timestamps in the DB as UTC, so we just need
@@ -180,9 +182,11 @@ class date_ical_plugin_row_ical_fields extends views_plugin_row {
       // If changed is unset, but created is, use that for last-modified.
       $event['last-modified'] = new DateObject($entity->created, 'UTC');
     }
-    $uri = entity_uri($entity_type, $entity);
-    $uri['options']['absolute'] = TRUE;
-    $event['url'] = url($uri['path'], $uri['options']);
+    if ($entity_type && $entity) {
+      $uri = entity_uri($entity_type, $entity);
+      $uri['options']['absolute'] = TRUE;
+      $event['url'] = url($uri['path'], $uri['options']);
+    }
 
     // Generate a unique ID for this event by emulating the way the Date module
     // creates a Date ID.