diff --git a/includes/Utils.php b/includes/Utils.php
index 02568da..b8f7f47 100644
--- a/includes/Utils.php
+++ b/includes/Utils.php
@@ -893,6 +893,10 @@ public static function titleFilter($where, $wp_query)
      */
     public static function validateDate($date)
     {
+        if (empty($date)) {
+            return false;
+        }
+
         if ($date instanceof \DateTime) {
             return true;
         }