https://github.com/magento/magento2/pull/31940

From 240253770cf2c41430d494c17730fe6484cbc18f Mon Sep 17 00:00:00 2001
From: Ihor Sviziev <svizev.igor@gmail.com>
Date: Tue, 2 Feb 2021 17:29:09 +0200
Subject: [PATCH 1/2] Fix js errors in customer data when component not
 initialized

---
 .../view/frontend/web/js/customer-data.js     | 28 +++++++++++++------
 1 file changed, 19 insertions(+), 9 deletions(-)

diff --git a/vendor/magento/module-customer/view/frontend/web/js/customer-data.js b/vendor/magento/module-customer/view/frontend/web/js/customer-data.js
index 2d7e26ecef76..854e80b5e35c 100644
--- a/vendor/magento/module-customer/view/frontend/web/js/customer-data.js
+++ b/vendor/magento/module-customer/view/frontend/web/js/customer-data.js
@@ -17,7 +17,9 @@ define([
 ], function ($, _, ko, sectionConfig, url) {
     'use strict';

-    var options = {},
+    var options = {
+            cookieLifeTime: 86400 //1 day by default
+        },
         storage,
         storageInvalidation,
         invalidateCacheBySessionTimeOut,
@@ -30,6 +32,18 @@ define([
     url.setBaseUrl(window.BASE_URL);
     options.sectionLoadUrl = url.build('customer/section/load');

+    function initStorage() {
+        $.cookieStorage.setConf({
+            path: '/',
+            expires: new Date(Date.now() + parseInt(options.cookieLifeTime, 10) * 1000)
+        });
+        storage = $.initNamespaceStorage('mage-cache-storage').localStorage;
+        storageInvalidation = $.initNamespaceStorage('mage-cache-storage-section-invalidation').localStorage;
+    }
+
+    // Initialize storage with default parameters to prevent JS errors while component still not initialized
+    initStorage();
+
     /**
      * @param {Object} invalidateOptions
      */
@@ -216,14 +230,7 @@ define([
         /**
          * Storage init
          */
-        initStorage: function () {
-            $.cookieStorage.setConf({
-                path: '/',
-                expires: new Date(Date.now() + parseInt(options.cookieLifeTime, 10) * 1000)
-            });
-            storage = $.initNamespaceStorage('mage-cache-storage').localStorage;
-            storageInvalidation = $.initNamespaceStorage('mage-cache-storage-section-invalidation').localStorage;
-        },
+        initStorage: initStorage,

         /**
          * Retrieve the list of sections that has expired since last page reload.
@@ -363,7 +370,10 @@ define([
          */
         'Magento_Customer/js/customer-data': function (settings) {
             options = settings;
+
+            // re-init storage with a new settings
             customerData.initStorage();
+
             invalidateCacheBySessionTimeOut(settings);
             invalidateCacheByCloseCookieSession();
             customerData.init();