diff --git a/htdocs/projet/class/project.class.php b/htdocs/projet/class/project.class.php
index cbee8d181ca..2261e06219b 100644
--- a/htdocs/projet/class/project.class.php
+++ b/htdocs/projet/class/project.class.php
@@ -599,13 +599,13 @@ class Project extends CommonObject
             $sql = "SELECT rowid FROM " . MAIN_DB_PREFIX . $tablename." WHERE ".$projectkey." IN (". $ids .") AND entity IN (".getEntity($type).")";
         }
 
-		if ($dates > 0)
+		if ($dates > 0 && ($type != 'project_task'))	// For table project_taks, we want the filter on date apply on project_time_spent table
 		{
 			if (empty($datefieldname) && ! empty($this->table_element_date)) $datefieldname=$this->table_element_date;
 			if (empty($datefieldname)) return 'Error this object has no date field defined';
 			$sql.=" AND (".$datefieldname." >= '".$this->db->idate($dates)."' OR ".$datefieldname." IS NULL)";
 		}
-    	if ($datee > 0)
+		if ($datee > 0 && ($type != 'project_task'))	// For table project_taks, we want the filter on date apply on project_time_spent table
 		{
 			if (empty($datefieldname) && ! empty($this->table_element_date)) $datefieldname=$this->table_element_date;
 			if (empty($datefieldname)) return 'Error this object has no date field defined';
diff --git a/htdocs/projet/element.php b/htdocs/projet/element.php
index b4d2a8b290f..4f5af0ca94f 100644
--- a/htdocs/projet/element.php
+++ b/htdocs/projet/element.php
@@ -532,7 +532,8 @@ if (! $showdatefilter)
 {
 	print '<div class="center centpercent">';
     print '<form action="'.$_SERVER["PHP_SELF"].'?id='.$projectid.'" method="post">';
-	print '<input type="hidden" name="tablename" value="'.$tablename.'">';
+    print '<input type="hidden" name="token" value="'.$_SESSION["newtoken"].'">';
+    print '<input type="hidden" name="tablename" value="'.$tablename.'">';
 	print '<input type="hidden" name="action" value="view">';
 	print '<table class="center"><tr>';
 	print '<td>'.$langs->trans("From").' ';
@@ -762,7 +763,8 @@ foreach ($listofreferent as $key => $value)
 				// Define form with the combo list of elements to link
 			    $addform.='<div class="inline-block valignmiddle">';
 			    $addform.='<form action="'.$_SERVER["PHP_SELF"].'?id='.$projectid.'" method="post">';
-				$addform.='<input type="hidden" name="tablename" value="'.$tablename.'">';
+			    $addform.='<input type="hidden" name="token" value="'.$_SESSION["newtoken"].'">';
+			    $addform.='<input type="hidden" name="tablename" value="'.$tablename.'">';
 				$addform.='<input type="hidden" name="action" value="addelement">';
 				$addform.='<input type="hidden" name="datesrfc" value="'.dol_print_date($dates, 'dayhourrfc').'">';
 				$addform.='<input type="hidden" name="dateerfc" value="'.dol_print_date($datee, 'dayhourrfc').'">';