diff --git a/htdocs/core/db/DoliDB.class.php b/htdocs/core/db/DoliDB.class.php
index 8ca84e0dd10..02864012dc3 100644
--- a/htdocs/core/db/DoliDB.class.php
+++ b/htdocs/core/db/DoliDB.class.php
@@ -229,6 +229,7 @@ abstract class DoliDB implements Database
 	{
 		if (! empty($sortfield))
 		{
+			$oldsortorder = '';
 			$return='';
 			$fields=explode(',', $sortfield);
 			$orders=explode(',', $sortorder);
@@ -238,15 +239,19 @@ abstract class DoliDB implements Database
 				if (! $return) $return.=' ORDER BY ';
 				else $return.=', ';
 
-				$return.=preg_replace('/[^0-9a-z_\.]/i', '', $val);
+				$return .= preg_replace('/[^0-9a-z_\.]/i', '', $val);	// Add field
 
 				$tmpsortorder = trim($orders[$i]);
 
 				// Only ASC and DESC values are valid SQL
 				if (strtoupper($tmpsortorder) === 'ASC') {
+					$oldsortorder = 'ASC';
 					$return .= ' ASC';
 				} elseif (strtoupper($tmpsortorder) === 'DESC') {
+					$oldsortorder = 'DESC';
 					$return .= ' DESC';
+				} else {
+					$return .= ' '.($oldsortorder ? $oldsortorder : 'ASC');
 				}
 
 				$i++;