diff --git a/Src/Asp.NetCore2/MongoDbTest/UnitTest/Insert.cs b/Src/Asp.NetCore2/MongoDbTest/UnitTest/Insert.cs
index 8260ac3db..68d53e515 100644
--- a/Src/Asp.NetCore2/MongoDbTest/UnitTest/Insert.cs
+++ b/Src/Asp.NetCore2/MongoDbTest/UnitTest/Insert.cs
@@ -25,6 +25,9 @@ namespace MongoDbTest
             if (db.Queryable<Student>().Count() != 3) Cases.ThrowUnitError();
             var list=db.Queryable<Student>().ToList();
             if (list.First().Name!="11"|| list.Last().Name != "33") Cases.ThrowUnitError();
+            db.Insertable(new Student() { Age = 1, Name = null, SchoolId = "111", CreateDateTime = DateTime.Now }).ExecuteCommand();
+            var list2=db.Queryable<Student>().Where(it => it.Name == null).ToList();
+            if(list2.Count!=1||list.First().Name!=null) Cases.ThrowUnitError();
         }
         [SqlSugar.SugarTable("UnitStudent1ddsfhssds3z1")]
         public class Student : MongoDbBase