diff --git a/htdocs/comm/propal/class/api_proposals.class.php b/htdocs/comm/propal/class/api_proposals.class.php
index e4b9a266198..1ce7f82b99d 100644
--- a/htdocs/comm/propal/class/api_proposals.class.php
+++ b/htdocs/comm/propal/class/api_proposals.class.php
@@ -395,8 +395,8 @@ class Proposals extends DolibarrApi
 
 		$request_data = (object) $request_data;
 
-		$request_data->desc = checkVal($request_data->desc, 'restricthtml');
-		$request_data->label = checkVal($request_data->label);
+		if (isset($request_data->desc)) $request_data->desc = checkVal($request_data->desc, 'restricthtml');
+		if (isset($request_data->label)) $request_data->label = checkVal($request_data->label);
 
 		$propalline = new PropaleLigne($this->db);
 		$result = $propalline->fetch($lineid);