user cannot access cart if not logged in

ecom-web/src/components/shopping-cart/shopping-cart.js

@@ -2,7 +2,7 @@ import React, { useState, useEffect } from 'react'
 import CartItem from './CartItem.js'
 import './shopping-cart.css'
 import { useSelector, useDispatch } from 'react-redux'
-import { Link } from 'react-router-dom'
+import { Link, Redirect } from 'react-router-dom'
 import { updateUserCart } from './../../actions/cart_actions'
 
 
@@ -74,7 +74,7 @@ export default function ShoppingCart() {
   // Sync Cart with backend and redux global state
   ////////////////////////////////////////////////////////////////
   useEffect(() => {
-
+    if (!userSession) return;
     const cartUpdateObj = {
       userId: userSession.email,
       cartItems: cartRefs
@@ -85,6 +85,7 @@ export default function ShoppingCart() {
   }, [cartItems])
 
 
+  if (!userSession) return <Redirect to="/product-market" />
   return (
     <div id="shoppingCartContainer">