diff --git a/htdocs/supplier_proposal/class/supplier_proposal.class.php b/htdocs/supplier_proposal/class/supplier_proposal.class.php
index 621a229121c..dc00360acfd 100644
--- a/htdocs/supplier_proposal/class/supplier_proposal.class.php
+++ b/htdocs/supplier_proposal/class/supplier_proposal.class.php
@@ -384,6 +384,7 @@ class SupplierProposal extends CommonObject
         if (empty($info_bits)) $info_bits=0;
         if (empty($rang)) $rang=0;
         if (empty($fk_parent_line) || $fk_parent_line < 0) $fk_parent_line=0;
+        if (empty($pu_ht)) $pu_ht=0;
 
         $remise_percent=price2num($remise_percent);
         $qty=price2num($qty);