From c403fa6fad435633630705dbdec0754bdf4d45c7 Mon Sep 17 00:00:00 2001
From: 28810 <28810@YEXIANGQIN>
Date: Thu, 18 Jul 2019 19:46:04 +0800
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---
 FreeSql/Internal/CommonExpression.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/FreeSql/Internal/CommonExpression.cs b/FreeSql/Internal/CommonExpression.cs
index 9be121fd..499db885 100644
--- a/FreeSql/Internal/CommonExpression.cs
+++ b/FreeSql/Internal/CommonExpression.cs
@@ -876,7 +876,7 @@ namespace FreeSql.Internal
                                 if (oper2.NodeType == ExpressionType.Parameter)
                                 {
                                     var oper2Parm = oper2 as ParameterExpression;
-                                    expStack.Push(Expression.Parameter(exp2.Type, oper2Parm.Name));
+                                    expStack.Push(exp2.Type.IsAbstract || exp2.Type.IsInterface ? oper2Parm : Expression.Parameter(exp2.Type, oper2Parm.Name));
                                 }
                                 else
                                     expStack.Push(oper2);