diff --git a/include/opening.inc.php b/include/opening.inc.php
index 295c81044..18fa6cae9 100644
--- a/include/opening.inc.php
+++ b/include/opening.inc.php
@@ -250,7 +250,7 @@ if ($sa=='step4')
         $amount='amount'.$idx;
         $ck='ck'.$idx;
         $result[$qcode]=$row['j_qcode'];
-        if (trim($row['j_qcode'])=='')
+        if (trim($row['j_qcode']??"")=='')
             $result[$poste]=$row['j_poste'];
         $result[$amount]=abs($row['solde']);
         if ($row['solde']>0)