diff --git a/js/webform.js b/js/webform.js
index c91612d..49cfa05 100644
--- a/js/webform.js
+++ b/js/webform.js
@@ -16,6 +16,10 @@ Drupal.webform.datepicker = function(context) {
   $('div.webform-datepicker').each(function() {
     var $webformDatepicker = $(this);
     var $calendar = $webformDatepicker.find('input.webform-calendar');
+    // Ensure the page we're on actually contains our datepicker markup, or quit.
+    if ($calendar.length == 0) { 
+      return;
+    }
     var startDate = $calendar[0].className.replace(/.*webform-calendar-start-(\d{4}-\d{2}-\d{2}).*/, '$1').split('-');
     var endDate = $calendar[0].className.replace(/.*webform-calendar-end-(\d{4}-\d{2}-\d{2}).*/, '$1').split('-');
     var firstDay = $calendar[0].className.replace(/.*webform-calendar-day-(\d).*/, '$1');