diff --git a/CHANGELOG.md b/CHANGELOG.md
index 2ff7b0b..de4c8a7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+1.3.1 - 2023.03.12
+* fix previously introduced bug
+* add method to clean a string
+
 1.3 - 2023.03.10
 * update to dotclear 2.25
 * use namespace
diff --git a/_define.php b/_define.php
index fccbd7e..e69e4a1 100644
--- a/_define.php
+++ b/_define.php
@@ -18,7 +18,7 @@ $this->registerModule(
     'Clean URLs',
     'Removes diacritics and punctuation from URLs',
     'Pierre Rudloff and contributors',
-    '1.3',
+    '1.3.1',
     [
         'requires'    => [['core', '2.25']],
         'permissions' => dcCore::app()->auth->makePermissions([
diff --git a/dcstore.xml b/dcstore.xml
index 8a75557..95f413b 100644
--- a/dcstore.xml
+++ b/dcstore.xml
@@ -2,10 +2,10 @@
 <modules xmlns:da="http://dotaddict.org/da/">
   <module id="cleanURLs">
     <name>Clean URLs</name>
-    <version>1.3</version>
+    <version>1.3.1</version>
     <author>Pierre Rudloff and contributors</author>
     <desc>Removes diacritics and punctuation from URLs</desc>
-    <file>https://github.com/JcDenis/cleanURLs/releases/download/v1.3/plugin-cleanURLs.zip</file>
+    <file>https://github.com/JcDenis/cleanURLs/releases/download/v1.3.1/plugin-cleanURLs.zip</file>
     <da:dcmin>2.25</da:dcmin>
     <da:details>https://github.com/JcDenis/cleanURLs</da:details>
     <da:support>https://github.com/JcDenis/cleanURLs</da:support>
diff --git a/src/CleanURLs.php b/src/CleanURLs.php
index 517eb65..1e12969 100644
--- a/src/CleanURLs.php
+++ b/src/CleanURLs.php
@@ -222,16 +222,27 @@ class CleanURLs
     }
 
     /**
-     * Clean URLs from diacritics and punctuation
+     * Clean string from diacritics and punctuation
+     *
+     * @param null|string $str The string
+     *
+     * @return null|string The cleaned string
+     * */
+    public static function cleanStr(?string $str): ?string
+    {
+        return is_string($str) ? strtr(self::removeAccents($str), ',!.?;', '-----') : $str;
+    }
+
+    /**
+     * Clean post URLs from diacritics and punctuation
      *
      * @param object $blog Current blog
      * @param object $cur  Cursor
      *
      * @return void
      * */
-    public static function clean($blog, $cur)
+    public static function cleanPost($blog, $cur)
     {
-        $cur->post_url = self::removeAccents($cur->post_url);
-        $cur->post_url = strtr($cur->post_url, ',!.?;', '-----');
+        $cur->post_url = self::cleanStr($cur->post_url);
     }
 }
diff --git a/src/Prepend.php b/src/Prepend.php
index 3eb58a8..1d9a4fb 100644
--- a/src/Prepend.php
+++ b/src/Prepend.php
@@ -32,7 +32,7 @@ class Prepend extends dcNsProcess
             return false;
         }
 
-        dcCore::app()->addBehavior('coreBeforePostCreate', [CleanURLs::class, 'clean']);
+        dcCore::app()->addBehavior('coreBeforePostCreate', [CleanURLs::class, 'cleanPost']);
 
         return true;
     }