diff --git a/Src/Asp.NetCore2/SqlSugar/Realization/Sqlite/SqliteProvider.cs b/Src/Asp.NetCore2/SqlSugar/Realization/Sqlite/SqliteProvider.cs
index f29bb62bf..953f1ffaf 100644
--- a/Src/Asp.NetCore2/SqlSugar/Realization/Sqlite/SqliteProvider.cs
+++ b/Src/Asp.NetCore2/SqlSugar/Realization/Sqlite/SqliteProvider.cs
@@ -106,7 +106,10 @@ namespace SqlSugar
                 }
                 if (sqlParameter.DbType == System.Data.DbType.Guid) {
                     sqlParameter.DbType = System.Data.DbType.String;
-                    sqlParameter.Value = sqlParameter.Value.ObjToString();
+                    if (sqlParameter.Value != DBNull.Value)
+                    {
+                        sqlParameter.Value = sqlParameter.Value.ObjToString();
+                    }
                 }
                 if (isVarchar && sqlParameter.DbType == System.Data.DbType.String)
                 {
diff --git a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
index 0abe2c7d1..ff0bcc28e 100644
--- a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
+++ b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCore.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>SqlSugarCore</id>
-    <version>5.0.6.4</version>
+    <version>5.0.6.5</version>
     <authors>sunkaixuan</authors>
     <owners>果糖大数据科技</owners>
     <licenseUrl>http://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>
diff --git a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCoreNoDrive.nuspec b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCoreNoDrive.nuspec
index 0cdbcb42b..ee26a20dd 100644
--- a/Src/Asp.NetCore2/SqlSugar/SqlSugarForCoreNoDrive.nuspec
+++ b/Src/Asp.NetCore2/SqlSugar/SqlSugarForCoreNoDrive.nuspec
@@ -2,7 +2,7 @@
 <package >
   <metadata>
     <id>SqlSugarCoreNoDrive</id>
-    <version>5.0.6.4</version>
+    <version>5.0.6.5</version>
     <authors>sunkaixuan</authors>
     <owners>Landa</owners>
     <licenseUrl>http://www.apache.org/licenses/LICENSE-2.0.html</licenseUrl>
diff --git a/Src/Asp.NetCore2/SqliteTest/UnitTest/UCodeFirst.cs b/Src/Asp.NetCore2/SqliteTest/UnitTest/UCodeFirst.cs
index 675a8e69e..80aebe7a7 100644
--- a/Src/Asp.NetCore2/SqliteTest/UnitTest/UCodeFirst.cs
+++ b/Src/Asp.NetCore2/SqliteTest/UnitTest/UCodeFirst.cs
@@ -3,7 +3,7 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
-
+using SqlSugar;
 namespace OrmTest
 {
     public partial class NewUnitTest
@@ -13,6 +13,17 @@ namespace OrmTest
             if (Db.DbMaintenance.IsAnyTable("UnitCodeTest1", false))
                 Db.DbMaintenance.DropTable("UnitCodeTest1");
             Db.CodeFirst.InitTables<UnitCodeTest1>();
+            Db.CodeFirst.InitTables<Test00111>();
+            Db.DbMaintenance.TruncateTable<Test00111>();
+            Db.Insertable(new Test00111()).ExecuteCommand();
+            var list = Db.Queryable<Test00111>().ToList();
+        }
+
+        public class Test00111
+        {
+            public int id { get; set; }
+            [SugarColumn(ColumnDataType = "guid",IsNullable =true)]
+            public Guid? creater { get; set; }
         }
         public class UnitCodeTest1
         {