diff --git a/xm-core/src/main/resources/mybatis/mapper/xm/core/dao/XmTaskMapper.xml b/xm-core/src/main/resources/mybatis/mapper/xm/core/dao/XmTaskMapper.xml
index fd0b10e6..16f46bcd 100644
--- a/xm-core/src/main/resources/mybatis/mapper/xm/core/dao/XmTaskMapper.xml
+++ b/xm-core/src/main/resources/mybatis/mapper/xm/core/dao/XmTaskMapper.xml
@@ -380,7 +380,7 @@
 	</select>
 	<update id="upBrowseTimes" parameterType="String">
 		update  xm_task
-		 set browse_times=browse_times+1
+		 set browse_times=ifnull(browse_times,0)+1
 		where id = #{id}
 	</update>