Update ContextBreadcrumbBuilder.php

src/Breadcrumb/ContextBreadcrumbBuilder.php

@@ -252,7 +252,7 @@ class ContextBreadcrumbBuilder implements BreadcrumbBuilderInterface {
         $contextBreadcrumbs = $reaction->execute();
         foreach ($contextBreadcrumbs as $contextBreadcrumb) {
           try {
-            if (mb_strlen($contextBreadcrumb['title'])) {
+            if (isset($contextBreadcrumb['title'])) {
               if ($contextBreadcrumb['url'] == '<front>') {
                 $contextBreadcrumb['url'] = '/';
               }