diff --git a/sgzb-modules/sgzb-material/src/main/resources/mapper/material/InventoryAndWarehousingMapper.xml b/sgzb-modules/sgzb-material/src/main/resources/mapper/material/InventoryAndWarehousingMapper.xml
index aafe7720..de24b8d4 100644
--- a/sgzb-modules/sgzb-material/src/main/resources/mapper/material/InventoryAndWarehousingMapper.xml
+++ b/sgzb-modules/sgzb-material/src/main/resources/mapper/material/InventoryAndWarehousingMapper.xml
@@ -170,7 +170,7 @@
     </insert>
     <update id="updateMaType">
         UPDATE ma_type
-        SET num = num + #{num},
+        SET num = IFNULL(num, 0) + #{num},
         update_time = now()
         <where>
             <if test="typeId != null ">and type_id = #{typeId}</if>