diff --git a/Models/SalesBillMapper.php b/Models/SalesBillMapper.php
index 9360d3f..a3ba544 100755
--- a/Models/SalesBillMapper.php
+++ b/Models/SalesBillMapper.php
@@ -127,7 +127,7 @@ final class SalesBillMapper extends BillMapper
             ->execute()
             ?->fetch();
 
-        return new Money($result === false || $result[1] ?? 0 === 0 ? 0 : (int) (((int) $result[0] ?? 0) / ((int) $result[1] ?? 0)));
+        return new Money($result === false || $result[1] ?? 0 === 0 ? 0 : (int) (((int) $result[0] ?? 0) / ((int) $result[1] ?? 1)));
     }
 
     /**