diff --git a/FreeSql.Tests/FreeSql.Tests/UnitTest1.cs b/FreeSql.Tests/FreeSql.Tests/UnitTest1.cs
index 1a86ff27..6d8081d5 100644
--- a/FreeSql.Tests/FreeSql.Tests/UnitTest1.cs
+++ b/FreeSql.Tests/FreeSql.Tests/UnitTest1.cs
@@ -355,6 +355,9 @@ namespace FreeSql.Tests
             });
             var dkkdksdjgj = g.mysql.Select<TaskBuild>().Where(a => a.OptionsEntity04 > GetUNIX_TIMESTAMP()).ToSql();
 
+            var dt1970 = new DateTime(1970, 1, 1);
+            var dkkdksdjgj22 = g.mysql.Select<TaskBuild>().Where(a => a.OptionsEntity04 > DateTime.Now.Subtract(dt1970).TotalSeconds).ToSql();
+
             var kdkdfm = g.sqlite.Select<AnswerQuestionnaire>()
                 .Include(a => a.MedicalRecord)
                 .ToSql();
diff --git a/FreeSql/Internal/CommonExpression.cs b/FreeSql/Internal/CommonExpression.cs
index e9b4b6fe..63ab1906 100644
--- a/FreeSql/Internal/CommonExpression.cs
+++ b/FreeSql/Internal/CommonExpression.cs
@@ -528,6 +528,7 @@ namespace FreeSql.Internal
                     var condExp = exp as ConditionalExpression;
                     return $"case when {ExpressionLambdaToSql(condExp.Test, tsc)} then {ExpressionLambdaToSql(condExp.IfTrue, tsc)} else {ExpressionLambdaToSql(condExp.IfFalse, tsc)} end";
                 case ExpressionType.Call:
+                    tsc.mapType = null;
                     var exp3 = exp as MethodCallExpression;
                     var callType = exp3.Object?.Type ?? exp3.Method.DeclaringType;
                     switch (callType.FullName)