diff --git a/composer.json b/composer.json
index a020ff80..79437032 100644
--- a/composer.json
+++ b/composer.json
@@ -3,7 +3,7 @@
   "description": "User Access Manager plugin for Wordpress",
   "type": "wordpress-plugin",
   "license": "GPL-2.0",
-  "version": "2.2.8",
+  "version": "2.2.9",
   "authors": [
     {
       "name": "Alexander Schneider",
diff --git a/package.json b/package.json
index 97e0fdce..f201afdc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "user-access-manager",
-  "version": "2.2.8",
+  "version": "2.2.9",
   "description": "[![Build Status](https://travis-ci.org/GM-Alex/user-access-manager.svg)](https://travis-ci.org/GM-Alex/user-access-manager)",
   "main": "index.js",
   "directories": {
diff --git a/readme.txt b/readme.txt
index 9522d13e..571b194b 100644
--- a/readme.txt
+++ b/readme.txt
@@ -4,7 +4,7 @@ Donate link: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_i
 Tags: admin, access, member area, members, member, member access, page, pages, post, posts, private, privacy, restrict, user, user access manager, user management
 Requires at least: 4.7
 Tested up to: 5.6
-Stable tag: 2.2.8
+Stable tag: 2.2.9
 
 With the "User Access Manager"-plugin you can manage the access to your posts, pages and files.
 
@@ -59,6 +59,9 @@ Here you found the changes in each version.
 
     Version     Date        Changes
 
+    2.2.9       2021/02/24  Type fixes for Yoast seo plugin.
+                            Fix some other type issues.
+
     2.2.8       2021/02/21  Some cleanup.
                             Type fixes for the short controller.
                             Fix some possible php notices and warnings.
diff --git a/src/Controller/Backend/SetupController.php b/src/Controller/Backend/SetupController.php
index 0671b84e..efcb690b 100644
--- a/src/Controller/Backend/SetupController.php
+++ b/src/Controller/Backend/SetupController.php
@@ -195,7 +195,7 @@ public function repairDatabaseAction()
     public function deleteDatabaseBackupAction()
     {
         $this->verifyNonce(self::SETUP_DELETE_BACKUP_NONCE);
-        $version = $this->getRequestParameter('uam_delete_backup');
+        $version = (string) $this->getRequestParameter('uam_delete_backup');
 
         if ($this->setupHandler->getDatabaseHandler()->deleteBackup($version) === true) {
             $this->setUpdateMessage(TXT_UAM_DELETE_DATABASE_BACKUP_SUCCESS);
diff --git a/src/Controller/Backend/TermObjectController.php b/src/Controller/Backend/TermObjectController.php
index aa0f2002..4d5a4641 100644
--- a/src/Controller/Backend/TermObjectController.php
+++ b/src/Controller/Backend/TermObjectController.php
@@ -41,13 +41,13 @@ public function addTermColumnsHeader(array $defaults): array
 
     /**
      * The function for the manage_categories_custom_column action.
-     * @param string $content Content for the column. Multiple filter calls are possible, so we need to append.
+     * @param string|null $content Content for the column. Multiple filter calls are possible, so we need to append.
      * @param string $columnName The column name.
      * @param int|string $id The id.
-     * @return string $content with content appended for self::COLUMN_NAME column
+     * @return string|null $content with content appended for self::COLUMN_NAME column
      * @throws UserGroupTypeException
      */
-    public function addTermColumn(string $content, string $columnName, $id): string
+    public function addTermColumn(?string $content, string $columnName, $id): ?string
     {
         if ($columnName === self::COLUMN_NAME) {
             $term = $this->objectHandler->getTerm($id);
diff --git a/src/Controller/Frontend/FrontendController.php b/src/Controller/Frontend/FrontendController.php
index 7ab96228..33799043 100644
--- a/src/Controller/Frontend/FrontendController.php
+++ b/src/Controller/Frontend/FrontendController.php
@@ -126,14 +126,14 @@ public function showAncestors(array $ancestors, $objectId, string $objectType):
 
     /**
      * Filter for Yoast SEO Plugin
-      * Hides the url from the site map if the user has no access
-      * @param string $url The url to check
+     * Hides the url from the site map if the user has no access
+     * @param string|array $url The url to check
      * @param string $type The object type
      * @param object $object The object
-      * @return false|string
+     * @return false|string
      * @throws UserGroupTypeException
      */
-    public function getWpSeoUrl(string $url, string $type, object $object)
+    public function getWpSeoUrl($url, string $type, object $object)
     {
         return ($this->accessHandler->checkObjectAccess($type, $object->ID) === true) ? $url : false;
     }
diff --git a/src/UserAccessManager.php b/src/UserAccessManager.php
index 5541d7d4..5bd73ac2 100644
--- a/src/UserAccessManager.php
+++ b/src/UserAccessManager.php
@@ -50,7 +50,7 @@
  */
 class UserAccessManager
 {
-    const VERSION = '2.2.8';
+    const VERSION = '2.2.9';
     const DB_VERSION = '1.6.1';
 
     /**
diff --git a/user-access-manager.php b/user-access-manager.php
index c37dcf0d..616f0255 100644
--- a/user-access-manager.php
+++ b/user-access-manager.php
@@ -3,7 +3,7 @@
  * Plugin Name: User Access Manager
  * Plugin URI: https://wordpress.org/plugins/user-access-manager/
  * Author URI: https://twitter.com/GM_Alex
- * Version: 2.2.8
+ * Version: 2.2.9
  * Author: Alexander Schneider
  * Description: Manage the access to your posts, pages, categories and files.
  * Text Domain: user-access-manager