diff --git a/ChangeLog b/ChangeLog
index ddafb08d110..5ef0217d077 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -5,6 +5,7 @@ English Dolibarr ChangeLog
 ***** ChangeLog for 3.3.3 compared to 3.3.2 *****
 
 - Fix: [ bug #903 ] Fatal error: Call to undefined function dol_get_first_day() in htdocs/commande/liste.php
+- Fix: [ bug #934 ] Error on proformat invoice creation (pgsql)
 
 ***** ChangeLog for 3.3.2 compared to 3.3.1 *****
 
diff --git a/htdocs/compta/facture/class/facture-rec.class.php b/htdocs/compta/facture/class/facture-rec.class.php
index b41fa735e7c..105885bfe1f 100644
--- a/htdocs/compta/facture/class/facture-rec.class.php
+++ b/htdocs/compta/facture/class/facture-rec.class.php
@@ -122,8 +122,8 @@ class FactureRec extends Facture
 			$sql.= ", '".$facsrc->socid."'";
 			$sql.= ", ".$conf->entity;
 			$sql.= ", ".$this->db->idate($now);
-			$sql.= ", '".$facsrc->amount."'";
-			$sql.= ", '".$facsrc->remise."'";
+			$sql.= ", ".(!empty($facsrc->amount)?$facsrc->amount:'0');
+			$sql.= ", ".(!empty($facsrc->remise)?$this->remise:'0');
 			$sql.= ", '".$this->db->escape($this->note)."'";
 			$sql.= ", '".$user->id."'";
 			$sql.= ", ".(! empty($facsrc->fk_project)?"'".$facsrc->fk_project."'":"null");