diff --git a/htdocs/comm/propal/class/api_proposals.class.php b/htdocs/comm/propal/class/api_proposals.class.php
index 204d4c12dc4..160f6999c40 100644
--- a/htdocs/comm/propal/class/api_proposals.class.php
+++ b/htdocs/comm/propal/class/api_proposals.class.php
@@ -424,11 +424,11 @@ class Proposals extends DolibarrApi
 		}
 
 		// update end of validity date
-		if(!empty($this->propal->duree_validite) && !empty($this->propal->date_creation) )
+		if (empty($this->propal->fin_validite) && !empty($this->propal->duree_validite) && !empty($this->propal->date_creation))
 		{
 			$this->propal->fin_validite = $this->propal->date_creation + ($this->propal->duree_validite * 24 * 3600);
 		}
-		if(!empty($this->propal->fin_validite))
+		if (!empty($this->propal->fin_validite))
 		{
 			if($this->propal->set_echeance(DolibarrApiAccess::$user, $this->propal->fin_validite)<0)
 			{