diff --git a/docs/CHANGELOG.md b/docs/CHANGELOG.md
index 06bca57c..c27e6907 100644
--- a/docs/CHANGELOG.md
+++ b/docs/CHANGELOG.md
@@ -1,6 +1,10 @@
 Changelog
 =========
 
+2.5.13 (Unreleased)
+-------------------
+- Enh: Automated code refactoring for HumHub 1.18.1 using Rector
+
 2.5.12 (August 4, 2026)
 -----------------------
 - Fix #436: Fix subpages box width on small screens
diff --git a/models/WikiPage.php b/models/WikiPage.php
index 91e1e77f..4182e8d7 100644
--- a/models/WikiPage.php
+++ b/models/WikiPage.php
@@ -425,9 +425,7 @@ public function afterMove(?ContentContainerActiveRecord $container = null)
 
     public function getIsCategory(): bool
     {
-        if (!isset($this->_isCategory)) {
-            $this->_isCategory = !$this->isNewRecord && $this->findChildren()->exists();
-        }
+        $this->_isCategory ??= !$this->isNewRecord && $this->findChildren()->exists();
 
         return $this->_isCategory;
     }
diff --git a/module.json b/module.json
index b7a0a3d3..b1a02941 100644
--- a/module.json
+++ b/module.json
@@ -2,8 +2,10 @@
     "id": "wiki",
     "name": "Wiki",
     "description": "Create and edit pages with this powerful tool. Build a collaborative knowledge base, view and share information with your colleagues.",
-    "keywords": ["wiki"],
-    "version": "2.5.12",
+    "keywords": [
+        "wiki"
+    ],
+    "version": "2.5.13",
     "humhub": {
         "minVersion": "1.18.1",
         "maxVersion": "1.18"
@@ -29,4 +31,4 @@
         "resources/screenshot6.png",
         "resources/screenshot7.png"
     ]
-}
+}
\ No newline at end of file
diff --git a/widgets/CategoryListItem.php b/widgets/CategoryListItem.php
index d20ef4f9..b7af763a 100644
--- a/widgets/CategoryListItem.php
+++ b/widgets/CategoryListItem.php
@@ -94,13 +94,9 @@ public function run()
             return '';
         }
 
-        if ($this->showDrag === null) {
-            $this->showDrag = $this->canAdminister();
-        }
+        $this->showDrag ??= $this->canAdminister();
 
-        if ($this->showAddPage === null) {
-            $this->showAddPage = $this->canCreate();
-        }
+        $this->showAddPage ??= $this->canCreate();
 
         $displaySubPages = $this->maxLevel === null || $this->level < $this->maxLevel;
 
@@ -137,18 +133,14 @@ public static function clear()
 
     private function canAdminister()
     {
-        if (static::$canAdminister === null) {
-            static::$canAdminister =  $this->contentContainer->can(AdministerPages::class);
-        }
+        static::$canAdminister ??= $this->contentContainer->can(AdministerPages::class);
 
         return static::$canAdminister;
     }
 
     private function canCreate()
     {
-        if (static::$canCreate === null) {
-            static::$canCreate = (new WikiPage($this->contentContainer))->content->canEdit();
-        }
+        static::$canCreate ??= (new WikiPage($this->contentContainer))->content->canEdit();
 
         return static::$canCreate;
     }
diff --git a/widgets/CategoryListView.php b/widgets/CategoryListView.php
index 6c2e7013..a721ca7f 100644
--- a/widgets/CategoryListView.php
+++ b/widgets/CategoryListView.php
@@ -71,9 +71,7 @@ public function init()
     {
         parent::init();
 
-        if ($this->service === null) {
-            $this->service = new HierarchyListService($this->contentContainer);
-        }
+        $this->service ??= new HierarchyListService($this->contentContainer);
     }
 
     /**
diff --git a/widgets/WikiSearchForm.php b/widgets/WikiSearchForm.php
index 35f6852e..2f6f98d8 100644
--- a/widgets/WikiSearchForm.php
+++ b/widgets/WikiSearchForm.php
@@ -34,9 +34,7 @@ public function init()
     {
         parent::init();
 
-        if (!isset($this->placeholder)) {
-            $this->placeholder = Yii::t('WikiModule.base', 'Search');
-        }
+        $this->placeholder ??= Yii::t('WikiModule.base', 'Search');
     }
 
     /**