diff --git a/htdocs/core/actions_fetchobject.inc.php b/htdocs/core/actions_fetchobject.inc.php
index b9cefe45306..e42c2e9a83b 100644
--- a/htdocs/core/actions_fetchobject.inc.php
+++ b/htdocs/core/actions_fetchobject.inc.php
@@ -30,16 +30,19 @@
 
 if (($id > 0 || (! empty($ref) && ! in_array($action, array('create', 'createtask', 'add')))) && (empty($cancel) || $id > 0))
 {
-    $ret = $object->fetch($id, $ref);
-    if ($ret > 0)
-    {
-        $object->fetch_thirdparty();
-        $id = $object->id;
-    }
-    else
-    {
-    	if (empty($object->error) && ! count($object->errors)) setEventMessages('Fetch on object return an error without filling $object->error nor $object->errors', null, 'errors');
-        else setEventMessages($object->error, $object->errors, 'errors');
-        $action='';
-    }
+	if (($id > 0 && is_numeric($id)) || ! empty($ref))	// To discard case when id is list of ids like '1,2,3...'
+	{
+	    $ret = $object->fetch($id, $ref);
+	    if ($ret > 0)
+	    {
+	        $object->fetch_thirdparty();
+	        $id = $object->id;
+	    }
+	    else
+	    {
+	    	if (empty($object->error) && ! count($object->errors)) setEventMessages('Fetch on object return an error without filling $object->error nor $object->errors', null, 'errors');
+	        else setEventMessages($object->error, $object->errors, 'errors');
+	        $action='';
+	    }
+	}
 }
diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index ea71f3e1100..6d0aa119316 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -6568,7 +6568,7 @@ function dol_getmypid()
 /**
  * Generate natural SQL search string for a criteria (this criteria can be tested on one or several fields)
  *
- * @param 	string|string[]	$fields 	String or array of strings, filled with the name of all fields in the SQL query we must check (combined with a OR)
+ * @param 	string|string[]	$fields 	String or array of strings, filled with the name of all fields in the SQL query we must check (combined with a OR). Example: array("p.field1","p.field2")
  * @param 	string 			$value 		The value to look for.
  *                          		    If param $mode is 0, can contains several keywords separated with a space or |
  *                                         like "keyword1 keyword2" = We want record field like keyword1 AND field like keyword2
diff --git a/htdocs/projet/class/task.class.php b/htdocs/projet/class/task.class.php
index 14f3c7e37d4..2a77de4f552 100644
--- a/htdocs/projet/class/task.class.php
+++ b/htdocs/projet/class/task.class.php
@@ -754,8 +754,8 @@ class Task extends CommonObject
 		}
 		if ($socid)	$sql.= " AND p.fk_soc = ".$socid;
 		if ($projectid) $sql.= " AND p.rowid in (".$projectid.")";
-		if ($filteronproj) $sql.= " AND (p.ref LIKE '%".$this->db->escape($filteronproj)."%' OR p.title LIKE '%".$this->db->escape($filteronproj)."%')";
-		if ($filteronprojstatus > -1) $sql.= " AND p.fk_statut = ".$filteronprojstatus;
+		if ($filteronproj) $sql.= natural_search(array("p.ref", "p.title"), $filteronproj);
+		if ($filteronprojstatus > -1) $sql.= " AND p.fk_statut IN (".$filteronprojstatus.")";
 		if ($morewherefilter) $sql.=$morewherefilter;
 		$sql.= " ORDER BY p.ref, t.rang, t.dateo";
 
diff --git a/htdocs/projet/ganttview.php b/htdocs/projet/ganttview.php
index 77e4709f4b9..c3552d714f2 100644
--- a/htdocs/projet/ganttview.php
+++ b/htdocs/projet/ganttview.php
@@ -1,6 +1,6 @@
 <?php
 /* Copyright (C) 2005      Rodolphe Quiedeville <rodolphe@quiedeville.org>
- * Copyright (C) 2004-2012 Laurent Destailleur  <eldy@users.sourceforge.net>
+ * Copyright (C) 2004-2017 Laurent Destailleur  <eldy@users.sourceforge.net>
  * Copyright (C) 2005-2012 Regis Houssin        <regis.houssin@capnetworks.com>
  *
  * This program is free software; you can redistribute it and/or modify
@@ -80,12 +80,12 @@ if (! empty($conf->use_javascript_ajax))
 	);
 }
 
-$title=$langs->trans("Project").' - '.$langs->trans("Gantt").' - '.$object->ref.' '.$object->name;
-if (! empty($conf->global->MAIN_HTML_TITLE) && preg_match('/projectnameonly/',$conf->global->MAIN_HTML_TITLE) && $object->name) $title=$object->ref.' '.$object->name.' - '.$langs->trans("Gantt");
+$title=$langs->trans("Project").' - '.$langs->trans("Gantt").($object->ref?' - '.$object->ref.' '.$object->name:'');
+if (! empty($conf->global->MAIN_HTML_TITLE) && preg_match('/projectnameonly/',$conf->global->MAIN_HTML_TITLE) && $object->name) $title=($object->ref?$object->ref.' '.$object->name.' - ':'').$langs->trans("Gantt");
 $help_url="EN:Module_Projects|FR:Module_Projets|ES:M&oacute;dulo_Proyectos";
 llxHeader("",$title,$help_url,'',0,0,$arrayofjs,$arrayofcss);
 
-if ($id > 0 || ! empty($ref))
+if (($id > 0 && is_numeric($id)) || ! empty($ref))
 {
 	// To verify role of users
 	//$userAccess = $object->restrictedProjectArea($user,'read');
@@ -93,7 +93,6 @@ if ($id > 0 || ! empty($ref))
 	//$userDelete = $object->restrictedProjectArea($user,'delete');
 	//print "userAccess=".$userAccess." userWrite=".$userWrite." userDelete=".$userDelete;
 
-
     $tab='gantt';
 
     $head=project_prepare_head($object);
@@ -195,7 +194,7 @@ if ($id > 0 || ! empty($ref))
  * Buttons actions
  */
 
-if ($id > 0)
+if ($id > 0 && is_numeric($id))
 {
 
 	print '<div class="tabsAction">';
@@ -229,7 +228,7 @@ else
 // Get list of tasks in tasksarray and taskarrayfiltered
 // We need all tasks (even not limited to a user because a task to user
 // can have a parent that is not affected to him).
-$tasksarray=$task->getTasksArray(0, 0, $object->id, $socid, 0);
+$tasksarray=$task->getTasksArray(0, 0, ($object->id ? $object->id : $id), $socid, 0);
 // We load also tasks limited to a particular user
 //$tasksrole=($_REQUEST["mode"]=='mine' ? $task->getUserRolesForProjectsOrTasks(0,$user,$object->id,0) : '');
 //var_dump($tasksarray);