Added casting to array. If this is missing it can happen that the returned value is null.

Classes/ViewHelpers/ProgressViewHelper.php

@@ -57,10 +57,7 @@ class ProgressViewHelper extends AbstractViewHelper
         //handling famous off by one
         $activeStep -= $offset;
         //make sure our array index is numeric
-        if (\is_iterable($links)) {
+        $links = \array_values((array)$links);
-            $links = \iterator_to_array($links);
-        }
-        $links = \array_values($links);
         if (!$linkCount) {
             $linkCount = \count($links);
         }

composer.json

@@ -1,49 +1,36 @@
 {
     "name": "digicomp/menu",
-    "description": "Helps with the creation of simple fluid based menus",
     "type": "neos-package",
+    "description": "Helps with the creation of simple fluid based menus",
     "keywords": [
-        "Neos",
+        "flow",
-        "Flow",
+        "neos",
         "menu"
     ],
-    "homepage": "https://git.digital-competence.de/Packages/DigiComp.Menu",
-    "license": "MIT",
     "authors": [
         {
             "name": "Ferdinand Kuhl",
             "email": "f.kuhl@digital-competence.de",
-            "homepage": "https://www.digital-competence.de",
+            "homepage": "http://www.digital-competence.de",
             "role": "Developer"
         }
     ],
+    "license": "MIT",
+    "homepage": "https://github.com/digicomp/DigiComp.Menu",
     "require": {
-        "php": ">=7.4.0",
+        "neos/flow": "~6.3",
-        "neos/flow": "^6.3.21"
+        "php": "^7.4"
-    },
-    "require-dev": {
-        "mikey179/vfsstream": "^1.6.1",
-        "neos/buildessentials": "^7.0.0",
-        "phpunit/phpunit": "~8.5",
-        "vimeo/psalm": "~4.22.0"
     },
     "autoload": {
         "psr-4": {
-            "DigiComp\\Menu\\": "Classes/"
+            "DigiComp\\Menu\\": "Classes"
         }
     },
-    "config": {
-        "sort-packages": true,
-        "platform-check": true
-    },
     "extra": {
         "branch-alias": {
             "dev-develop": "3.0.x-dev",
             "dev-version/2.x-dev": "2.0.x-dev"
         },
-        "neos": {
-            "package-key": "DigiComp.Menu"
-        },
         "applied-flow-migrations": [
             "TYPO3.Fluid-20150214130800",
             "TYPO3.Fluid-20141121091700",