首次登录404错误bug

web/users/js/login.js

@@ -21,7 +21,7 @@ $(document).ready(function () {
             data: {"account": account, "pw": pw},
             success: function (response) {
                 if (response.error === 0) {
-                    const url = response.last_page !== null && response.last_page !== '' ?
+                    const url = response.last_page !== null && response.last_page !== undefined && response.last_page !== '' ?
                         response.last_page : '/pm';
                     if (response.login_ask === 0) {
                         location.href = url;