Merge forwardport of #11299 to 2.3-develop branch

Applied pull request patch https://github.com/magento/magento2/pull/11299.patch (created by @lano-vargas) based on commit(s):
  1. 17d37b2

Fixed GitHub Issues in 2.3-develop branch:
  - #11275: Call to a member function addCrumb() (reported by @lano-vargas)

app/code/Magento/Sales/Helper/Guest.php

@@ -178,6 +178,9 @@ public function loadValidOrder(App\RequestInterface $request)
     public function getBreadcrumbs(\Magento\Framework\View\Result\Page $resultPage)
     {
         $breadcrumbs = $resultPage->getLayout()->getBlock('breadcrumbs');
+        if (!$breadcrumbs) {
+            return;
+        }
         $breadcrumbs->addCrumb(
             'home',
             [