diff --git a/htdocs/core/class/CMailFile.class.php b/htdocs/core/class/CMailFile.class.php
index 45998a78869..8fd6e48d8a3 100644
--- a/htdocs/core/class/CMailFile.class.php
+++ b/htdocs/core/class/CMailFile.class.php
@@ -1027,7 +1027,7 @@ class CMailFile
 		$mimedone=0;
 		$out = "";
 
-		if ($filename_list)
+		if (is_array($filename_list))
 		{
 			$filename_list_size=count($filename_list);
 			for($i=0;$i < $filename_list_size;$i++)
@@ -1199,7 +1199,7 @@ class CMailFile
 	/**
 	 * Attach an image to email (mode = 'mail')
 	 *
-	 * @param	array	$images_list	Tableau
+	 * @param	array	$images_list	Array of array image
 	 * @return	string					Chaine images encodees
 	 */
 	function write_images($images_list)
@@ -1207,7 +1207,7 @@ class CMailFile
         // phpcs:enable
 		$out = '';
 
-		if ($images_list)
+		if (is_array($images_list))
 		{
 			foreach ($images_list as $img)
 			{