diff --git a/sgzb-modules/sgzb-base/src/main/resources/mapper/app/LeaseOutDetailsMapper.xml b/sgzb-modules/sgzb-base/src/main/resources/mapper/app/LeaseOutDetailsMapper.xml
index b5847b39..6650ba71 100644
--- a/sgzb-modules/sgzb-base/src/main/resources/mapper/app/LeaseOutDetailsMapper.xml
+++ b/sgzb-modules/sgzb-base/src/main/resources/mapper/app/LeaseOutDetailsMapper.xml
@@ -19,7 +19,7 @@
         UPDATE
             lease_apply_details
         SET
-            al_num = al_num + #{record.outNum},
+            al_num = IF(al_num IS NULL, #{record.outNum}, al_num + #{record.outNum}),
             <if test="record.updateBy != null and record.updateBy!= '' ">
                 update_by = #{record.updateBy},
             </if>