diff --git a/dev/dolibarr_changes.txt b/dev/dolibarr_changes.txt
index f8d50ca6402..590ad9e1e63 100644
--- a/dev/dolibarr_changes.txt
+++ b/dev/dolibarr_changes.txt
@@ -128,3 +128,18 @@ Change also file Luracast/Restler/explorer/index.html
     	// @CHANGE LDR
     	if (! is_string($className)) return;
     	//var_dump($className);
+
+    	
+    	
+PARSEDOWN
+---------
+
+* Fix to avoid fatal error when mb_strlen not available:
+
+	// @CHANGE LDR Fix when mb_strlen is not available
+	//$shortage = 4 - mb_strlen($line, 'utf-8') % 4;
+	if (function_exists('mb_strlen')) $len = mb_strlen($line, 'utf-8');
+	else $len = strlen($line);
+	$shortage = 4 - $len % 4;
+                	
+    	
\ No newline at end of file
diff --git a/htdocs/includes/parsedown/Parsedown.php b/htdocs/includes/parsedown/Parsedown.php
index 20863a7537a..a1ec563683f 100644
--- a/htdocs/includes/parsedown/Parsedown.php
+++ b/htdocs/includes/parsedown/Parsedown.php
@@ -141,7 +141,11 @@ class Parsedown
 
                 foreach ($parts as $part)
                 {
-                    $shortage = 4 - mb_strlen($line, 'utf-8') % 4;
+                	// @CHANGE LDR Fix when mb_strlen is not available
+                	//$shortage = 4 - mb_strlen($line, 'utf-8') % 4;
+                	if (function_exists('mb_strlen')) $len = mb_strlen($line, 'utf-8');
+                	else $len = strlen($line);
+                	$shortage = 4 - $len % 4;
 
                     $line .= str_repeat(' ', $shortage);
                     $line .= $part;
@@ -515,10 +519,10 @@ class Parsedown
                 ),
             );
 
-            if($name === 'ol') 
+            if($name === 'ol')
             {
                 $listStart = stristr($matches[0], '.', true);
-                
+
                 if($listStart !== '1')
                 {
                     $Block['element']['attributes'] = array('start' => $listStart);