diff --git a/FreeSql.Tests/FreeSql.Tests/SqlServer/SqlServerExpression/OtherTest.cs b/FreeSql.Tests/FreeSql.Tests/SqlServer/SqlServerExpression/OtherTest.cs
index 0cc5b7d6..94c1cfb1 100644
--- a/FreeSql.Tests/FreeSql.Tests/SqlServer/SqlServerExpression/OtherTest.cs
+++ b/FreeSql.Tests/FreeSql.Tests/SqlServer/SqlServerExpression/OtherTest.cs
@@ -39,6 +39,9 @@ namespace FreeSql.Tests.SqlServerExpression
         [Fact]
         public void Boolean()
         {
+            var s1 = select.Where(a => a.testFieldBoolNullable.HasValue).ToList();
+            var s2 = select.GroupBy(a => new { IsCheck = a.testFieldBoolNullable.HasValue ? true : false }).ToList(g => g.Key);
+
             var t1 = select.Where(a => a.testFieldBool == true).ToList();
             var t2 = select.Where(a => a.testFieldBool != true).ToList();
             var t3 = select.Where(a => a.testFieldBool == false).ToList();
diff --git a/FreeSql/Internal/CommonExpression.cs b/FreeSql/Internal/CommonExpression.cs
index 11a33573..9b13cb3c 100644
--- a/FreeSql/Internal/CommonExpression.cs
+++ b/FreeSql/Internal/CommonExpression.cs
@@ -691,7 +691,7 @@ namespace FreeSql.Internal
                     }
                 }
             }
-            if (leftExp.Type.NullableTypeOrThis() == typeof(bool) && (leftExp.NodeType != ExpressionType.MemberAccess && rightExp.NodeType != ExpressionType.MemberAccess))
+            if (leftExp.Type.NullableTypeOrThis() == typeof(bool) && (left.EndsWith(" IS NOT NULL") || left.EndsWith(" IS NULL") || leftExp.NodeType != ExpressionType.MemberAccess && rightExp.NodeType != ExpressionType.MemberAccess))
             {
                 var leftExpCall = leftExp as MethodCallExpression;
                 if (leftExpCall == null || !(leftExpCall.Method.DeclaringType == typeof(SqlExt) && leftExpCall.Method.Name == nameof(SqlExt.IsNull)))