fix problem on simultaneous login

frontend/frontend/src/api/user.js

@@ -1,6 +1,7 @@
 import axios from 'axios';
 
 import { HOST } from '../constants';
+import { logout } from '../redux/actions/userActions';
 
 const authenticate = async (code, privateAccess, userKey) => {
   try {
@@ -26,6 +27,9 @@ const getUserMetadata = async (userKey) => {
     const result = await axios.get(fullUrl);
     return result.data;
   } catch (error) {
+    if (error.response && error.response.status === 404) {
+      logout(userKey);
+    }
     console.error(error);
     return null;
   }