diff --git a/cgwebp.xml b/cgwebp.xml
index 19f60bb..4b337d3 100644
--- a/cgwebp.xml
+++ b/cgwebp.xml
@@ -1,13 +1,13 @@
 <?xml version="1.0" encoding="utf-8" ?>
 <extension type="plugin" version="4.0" group="system" method="upgrade">
     <name>System - CG Webp</name>
-    <creationDate>2024-05-05</creationDate>
+    <creationDate>2024-08-07</creationDate>
     <author>ConseilGouz</author>
 	<copyright>Copyright (C) 2024 ConseilGouz. All rights reserved.</copyright>
 	<license>GNU/GPL</license>
     <authorEmail>pascal.leconte@conseilgouz.com</authorEmail>
     <authorUrl>https://www.conseilgouz.com</authorUrl>
-    <version>1.2.4</version>
+    <version>1.2.5</version>
     <description>PLG_SYSTEM_CGWEBP_DESCRIPTION</description>
     <namespace path="src">Conseilgouz\Plugin\System\Cgwebp</namespace>
     <scriptfile>script.cgwebp.php</scriptfile>
diff --git a/plg_system_cgwebp_changelog.xml b/plg_system_cgwebp_changelog.xml
index 1d7d0cf..45a656f 100644
--- a/plg_system_cgwebp_changelog.xml
+++ b/plg_system_cgwebp_changelog.xml
@@ -1,4 +1,19 @@
 <changelogs>
+	<changelog>
+		<element>plg_system_cgwebp</element>
+		<type>plugin</type>
+		<group>system</group>
+		<version>1.2.5</version>
+        <note>
+            <item>Update : 07/08/2024</item>
+        </note>
+        <fix>
+            <item>Undefined array key  $_SERVER['HTTP_ACCEPT']</item>
+        </fix>
+        <addition>
+            <item>Add New flag in debug data</item>
+        </addition>
+    </changelog>
 	<changelog>
 		<element>plg_system_cgwebp</element>
 		<type>plugin</type>
diff --git a/src/Extension/Cgwebp.php b/src/Extension/Cgwebp.php
index 378b26e..d4a4f43 100644
--- a/src/Extension/Cgwebp.php
+++ b/src/Extension/Cgwebp.php
@@ -107,12 +107,14 @@ private function gowebp($sHtml, $onefilter)
                 '/' . $regexPath . '\/.*?(' . implode('|', $extensions) . ')(?=[\'"?#])|#joomlaImage.*?(' . implode('|', $extensions) . ').+?(?=\")\b/',
                 function ($match) use ($quality, $stored_time, $excludedArr, &$debugTarget, $regexPath) {
                     $img = $match[0];
-                    $newImg = $this->imgToWebp($img, $quality, $excludedArr, $stored_time, $regexPath, $match);
-                    $debugTarget[] = array(
-                        'source' => $img,
-                        'target' => $newImg
-                    );
-
+                    $newImg = $this->imgToWebp($img, $quality, $excludedArr, $stored_time, $regexPath, $match,$debugTarget);
+                    if (!$newImg) { // no conversion
+                        $debugTarget[] = array(
+                            'source' => $image,
+                            'target' => $newImg,
+                            'new'    => false
+                        );
+                    }
                     return $newImg ? $newImg : $img;
                 },
                 $sHtml
@@ -148,11 +150,12 @@ private function isExcludedDirectory($image, $excluded)
         return $exist;
     }
 
-    private function imgToWebp($image, $quality = 100, $excluded = array(), $stored_time = 5, $regexPath = '', $fullRegex = '')
+    private function imgToWebp($image, $quality = 100, $excluded = array(), $stored_time = 5, $regexPath = '', $fullRegex = '', &$debugTarget = [])
     {
         $imgPath = JPATH_ROOT . '/' . $image;
         $imgInfo = pathinfo($imgPath);
         $imgHash = md5($imgPath);
+        $bNew    = false;
 
         if(!isset($imgInfo['extension']) || !$imgInfo['extension']) {
             return;
@@ -201,6 +204,7 @@ private function imgToWebp($image, $quality = 100, $excluded = array(), $stored_
                             imagealphablending($img, true);
                             imagesavealpha($img, true);
                             imagewebp($img, $newImage, $quality);
+                            $bNew = true;
                         } catch (\Throwable $throwable) {
                             return false; // conversion error :ignore image
                         }
@@ -209,6 +213,11 @@ private function imgToWebp($image, $quality = 100, $excluded = array(), $stored_
                 $newFile = str_replace(JPATH_ROOT . '/', "", $newImage)."?ver=".$imgHash;
                 $this->_webps[$imgHash] = $newFile;
             }
+            $debugTarget[] = array(
+                 'source' => $image,
+                 'target' => $this->_webps[$imgHash],
+                 'new'    => $bNew
+            );
             return $this->_webps[$imgHash];
         }
     }
diff --git a/src/Helper/CgwebpHelper.php b/src/Helper/CgwebpHelper.php
index ba518fb..922c722 100644
--- a/src/Helper/CgwebpHelper.php
+++ b/src/Helper/CgwebpHelper.php
@@ -17,30 +17,33 @@ class CgwebpHelper {
 
     public static function browserSupportWebp() {
   
-        $user_agent = $_SERVER['HTTP_USER_AGENT'];
-
         if(!isset($_SERVER['HTTP_USER_AGENT'])) return false;
 
+        $user_agent = $_SERVER['HTTP_USER_AGENT'];
 
         // If browser is Internet Explorer
-        if (isset($_SERVER['HTTP_USER_AGENT']) &&
-            (strpos($_SERVER['HTTP_USER_AGENT'], 'MSIE') !== false)) return false;
+        if (strpos(user_agent, 'MSIE') !== false) return false;
 
         // If user browser is safari and is not Opera
         if(
             strpos($user_agent, 'Safari') &&
-            !strpos( $_SERVER['HTTP_USER_AGENT'], ' Chrome/' ) &&
+            !strpos( $user_agent, ' Chrome/' ) &&
             !(strpos($user_agent, 'Edge'))
         ) return false;
 
         // If windows mobile
-        if(strpos($_SERVER['HTTP_USER_AGENT'], 'Windows Phone 8.1')) return false;
+        if(strpos($user_agent, 'Windows Phone 8.1')) return false;
 
+        // If browser doesnt support webp
+        if (isset($_SERVER['HTTP_ACCEPT'])) {
+            if (!strpos( $_SERVER['HTTP_ACCEPT'], 'image/webp' )) {
+                return false;
+            }
+        }
 
         // If browser doesnt support webp and is not chrome/firefox/opera/edge
         if(
-            !strpos( $_SERVER['HTTP_ACCEPT'], 'image/webp' ) &&
-            !strpos( $_SERVER['HTTP_USER_AGENT'], ' Chrome/' ) &&
+            !strpos($user_agent, ' Chrome/' ) &&
             !strpos($user_agent, 'Firefox') &&
             !(strpos($user_agent, 'Opera') || strpos($user_agent, 'OPR/')) &&
             !(strpos($user_agent, 'Edge'))