diff --git a/acqui/basketgroup.pl b/acqui/basketgroup.pl
index c9db3b379a..36c446224f 100755
--- a/acqui/basketgroup.pl
+++ b/acqui/basketgroup.pl
@@ -145,7 +145,7 @@ sub BasketTotal {
             $total = $total * ( $gst / 100 +1);
         }
     }
-    $total .= $bookseller->{invoiceprice};
+    $total .= $bookseller->{invoiceprice} // 0;
     return $total;
 }