diff --git a/src/pages/AdminPanel/UserController.jsx b/src/pages/AdminPanel/UserController.jsx
index 2ef4756..318a273 100644
--- a/src/pages/AdminPanel/UserController.jsx
+++ b/src/pages/AdminPanel/UserController.jsx
@@ -14,7 +14,17 @@ export default function UserController() {
     const userColumns = [
         makeColumn('Логин', 'login', {
             editable: true,
-            formItemRules: [{ required: true }, ...createLoginRules],
+            formItemRules: [
+                { required: true },
+                ...createLoginRules,
+                () => ({
+                    validator(_, value) {
+                        if (!value || users.findIndex((user) => user.login === value) < 0)
+                            return Promise.resolve()
+                        return Promise.reject(new Error('Логин уже занят!'))
+                    }
+                })
+            ],
             sorter: makeStringSorter('login'),
         }),
         makeColumn('Фамилия', 'surname', {