diff --git a/htdocs/core/lib/functions.lib.php b/htdocs/core/lib/functions.lib.php
index cab71ac6685..e088f764040 100644
--- a/htdocs/core/lib/functions.lib.php
+++ b/htdocs/core/lib/functions.lib.php
@@ -4147,7 +4147,11 @@ function setEventMessages($mesg, $mesgs, $style='mesgs')
 {
 	if (! in_array((string) $style, array('mesgs','warnings','errors'))) dol_print_error('','Bad parameter for setEventMessage');
 	if (empty($mesgs)) setEventMessage($mesg, $style);
-	else setEventMessage($mesgs, $style);
+	else
+	{
+		if (! empty($mesg) && ! in_array($mesg, $mesgs)) setEventMessage($mesg, $style);	// Add message string if not already into array
+		setEventMessage($mesgs, $style);
+	}
 }
 
 /**
diff --git a/htdocs/projet/class/task.class.php b/htdocs/projet/class/task.class.php
index 13360110310..62052ebaa29 100644
--- a/htdocs/projet/class/task.class.php
+++ b/htdocs/projet/class/task.class.php
@@ -285,8 +285,8 @@ class Task extends CommonObject
         $sql.= " description=".(isset($this->description)?"'".$this->db->escape($this->description)."'":"null").",";
         $sql.= " duration_effective=".(isset($this->duration_effective)?$this->duration_effective:"null").",";
         $sql.= " planned_workload=".(isset($this->planned_workload)?$this->planned_workload:"0").",";
-        $sql.= " dateo=".($this->date_start!=''?$this->db->idate($this->date_start):'null').",";
-        $sql.= " datee=".($this->date_end!=''?$this->db->idate($this->date_end):'null').",";
+        $sql.= " dateo=".($this->date_start!=''?"'".$this->db->idate($this->date_start)."'":'null').",";
+        $sql.= " datee=".($this->date_end!=''?"'".$this->db->idate($this->date_end)."'":'null').",";
         $sql.= " progress=".$this->progress.",";
         $sql.= " rang=".((!empty($this->rang))?$this->rang:"0");
         $sql.= " WHERE rowid=".$this->id;
diff --git a/htdocs/projet/tasks.php b/htdocs/projet/tasks.php
index d1d5092628e..7aea9314e5a 100644
--- a/htdocs/projet/tasks.php
+++ b/htdocs/projet/tasks.php
@@ -1,6 +1,6 @@
 <?php
 /* Copyright (C) 2005      Rodolphe Quiedeville <rodolphe@quiedeville.org>
- * Copyright (C) 2004-2013 Laurent Destailleur  <eldy@users.sourceforge.net>
+ * Copyright (C) 2004-2014 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
diff --git a/htdocs/projet/tasks/task.php b/htdocs/projet/tasks/task.php
index 8e5b664759e..da200d565b6 100644
--- a/htdocs/projet/tasks/task.php
+++ b/htdocs/projet/tasks/task.php
@@ -58,9 +58,11 @@ $projectstatic = new Project($db);
 
 // fetch optionals attributes and labels
 $extralabels=$extrafields->fetch_name_optionals_label($object->table_element);
+
+
 /*
  * Actions
-*/
+ */
 
 if ($action == 'update' && ! $_POST["cancel"] && $user->rights->projet->creer)
 {
@@ -91,11 +93,10 @@ if ($action == 'update' && ! $_POST["cancel"] && $user->rights->projet->creer)
 		$ret = $extrafields->setOptionalsFromPost($extralabels,$object);
 
 		$result=$object->update($user);
-		
+
 		if ($result < 0)
 		{
-		    setEventMessage($object->error,'errors');
-		    setEventMessage($object->errors,'errors');
+		    setEventMessages($object->error,$object->errors,'errors');
 		}
 	}
 	else
@@ -121,8 +122,7 @@ if ($action == 'confirm_delete' && $confirm == "yes" && $user->rights->projet->s
 		}
 		else
 		{
-			$langs->load("errors");
-			setEventMessage($langs->trans($object->error), 'errors');
+		    setEventMessages($object->error,$object->errors,'errors');
 			$action='';
 		}
 	}