diff --git a/src/main/resources/mapper/quote/QuoteDetailToolMapper.xml b/src/main/resources/mapper/quote/QuoteDetailToolMapper.xml
index bfca7952..ace8614d 100644
--- a/src/main/resources/mapper/quote/QuoteDetailToolMapper.xml
+++ b/src/main/resources/mapper/quote/QuoteDetailToolMapper.xml
@@ -87,7 +87,7 @@
             '',
             isnull(th.standard_cost,0),
             0,
-            case when rt.tool_qty = 0 then 0 else th.standard_cost / rt.tool_qty end,
+            ISNULL(case when rt.tool_qty = 0 then 0 else th.standard_cost / rt.tool_qty end,0),
             null,
             #{createBy},
             #{createDate},