diff --git a/Src/Asp.Net/SqlSugar/Realization/Sqlite/SqliteProvider.cs b/Src/Asp.Net/SqlSugar/Realization/Sqlite/SqliteProvider.cs
index a08b24e97..00d6ef605 100644
--- a/Src/Asp.Net/SqlSugar/Realization/Sqlite/SqliteProvider.cs
+++ b/Src/Asp.Net/SqlSugar/Realization/Sqlite/SqliteProvider.cs
@@ -107,9 +107,13 @@ namespace SqlSugar
                     this.OutputParameters.RemoveAll(it => it.ParameterName == sqlParameter.ParameterName);
                     this.OutputParameters.Add(sqlParameter);
                 }
-                if (sqlParameter.DbType == System.Data.DbType.Guid) {
+                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)
                 {