diff --git a/htdocs/lib/functions.lib.php b/htdocs/lib/functions.lib.php
index 20c80518799..b487b4fa92a 100644
--- a/htdocs/lib/functions.lib.php
+++ b/htdocs/lib/functions.lib.php
@@ -3458,7 +3458,7 @@ function dol_htmloutput_errors($mesgstring='',$mesgarray='')
 {
 	global $langs;
 
-	$ret = 0;
+	$ret = '';
 	$langs->load("errors");
 
 	if (is_array($mesgarray) && sizeof($mesgarray))