diff --git a/bonus-modules/bonus-material/src/main/resources/mapper/material/task/TmTaskMapper.xml b/bonus-modules/bonus-material/src/main/resources/mapper/material/task/TmTaskMapper.xml
index d55c533a..6a133034 100644
--- a/bonus-modules/bonus-material/src/main/resources/mapper/material/task/TmTaskMapper.xml
+++ b/bonus-modules/bonus-material/src/main/resources/mapper/material/task/TmTaskMapper.xml
@@ -106,7 +106,7 @@ PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
     </delete>
 
     <select id="getMonthMaxOrderByDate" resultType="java.lang.Integer">
-        select max(month_order) from tm_task
+        select COALESCE(max(month_order), 0) from tm_task
         where
             month(create_time) = #{month} and year(create_time) = #{year}
             <if test="taskType != null and taskType !=''">