diff --git a/Controller/Controller.php b/Controller/Controller.php
index 9ea63bc..5151483 100755
--- a/Controller/Controller.php
+++ b/Controller/Controller.php
@@ -17,7 +17,7 @@ namespace Modules\Knowledgebase\Controller;
 use phpOMS\Module\ModuleAbstract;
 
 /**
- * Task class.
+ * Knowledgebase controller class.
  *
  * @package Modules\Knowledgebase
  * @license OMS License 1.0
diff --git a/Models/NullWikiApp.php b/Models/NullWikiApp.php
index d5177fe..415805e 100755
--- a/Models/NullWikiApp.php
+++ b/Models/NullWikiApp.php
@@ -15,7 +15,7 @@ declare(strict_types=1);
 namespace Modules\Knowledgebase\Models;
 
 /**
- * Task class.
+ * Null model class.
  *
  * @package Modules\Knowledgebase\Models
  * @license OMS License 1.0
diff --git a/Models/NullWikiCategory.php b/Models/NullWikiCategory.php
index 8abbf27..999037c 100755
--- a/Models/NullWikiCategory.php
+++ b/Models/NullWikiCategory.php
@@ -15,7 +15,7 @@ declare(strict_types=1);
 namespace Modules\Knowledgebase\Models;
 
 /**
- * Task class.
+ * Null model class.
  *
  * @package Modules\Knowledgebase\Models
  * @license OMS License 1.0
diff --git a/Models/NullWikiDoc.php b/Models/NullWikiDoc.php
index afcb4c0..a7fb77e 100755
--- a/Models/NullWikiDoc.php
+++ b/Models/NullWikiDoc.php
@@ -15,7 +15,7 @@ declare(strict_types=1);
 namespace Modules\Knowledgebase\Models;
 
 /**
- * Task class.
+ * Null model class.
  *
  * @package Modules\Knowledgebase\Models
  * @license OMS License 1.0
diff --git a/Models/WikiCategory.php b/Models/WikiCategory.php
index 3b4804a..7a2a71e 100755
--- a/Models/WikiCategory.php
+++ b/Models/WikiCategory.php
@@ -112,13 +112,13 @@ class WikiCategory implements \JsonSerializable
      *
      * @since 1.0.0
      */
-    public function setL11n($name, string $lang = ISO639x1Enum::_EN) : void
+    public function setL11n(string|WikiCategoryL11n $name, string $lang = ISO639x1Enum::_EN) : void
     {
         if ($name instanceof WikiCategoryL11n) {
             $this->name = $name;
-        } elseif ($this->name instanceof WikiCategoryL11n && \is_string($name)) {
+        } elseif (isset($this->name) && $this->name instanceof WikiCategoryL11n) {
             $this->name->name = $name;
-        } elseif (\is_string($name)) {
+        } else {
             $this->name       = new WikiCategoryL11n();
             $this->name->name = $name;
             $this->name->setLanguage($lang);