diff --git a/src/WordPress/WPCrm.php b/src/WordPress/WPCrm.php
index f362020..4d86310 100644
--- a/src/WordPress/WPCrm.php
+++ b/src/WordPress/WPCrm.php
@@ -536,7 +536,7 @@ class WPCrm
      */
     private static function saveOrUpdateUserToTable()
     {
-        if (self::getUserFromTable(self::$user->hashcode)) {
+        if (is_string(self::$user->hashcode) and self::getUserFromTable(self::$user->hashcode)) {
             self::query(
                 'UPDATE `ldc_wp_customers` SET `email` = %s, `uuid` = %s WHERE `hashcode` = %s',
                 [