--- /Users/oli/Desktop/xmlsitemap/xmlsitemap_user/xmlsitemap_user.module
+++ xmlsitemap_user.module
@@ -242,7 +242,7 @@
  * Implementation of hook_cron().
  */
 function xmlsitemap_user_cron() {
-  if (db_result(db_query_range("SELECT COUNT(*) FROM {users} u LEFT JOIN {xmlsitemap_user} xu ON xu.uid = u.uid WHERE u.uid <> 0 AND xu.uid IS NULL", 0, 1))) {
+  if (db_result(db_query_range("SELECT COUNT(*) FROM {users} u LEFT JOIN {xmlsitemap_user} xu ON xu.uid = u.uid WHERE u.uid <> 0 ", 0, 1))) {
     db_query("
       INSERT INTO {xmlsitemap_user} (uid, last_changed)
       SELECT u.uid, u.created FROM {users} u