From da0f0d8dd17018bc86a4a28febdfb7aec5b928d0 Mon Sep 17 00:00:00 2001
From: iRumba <reloader2003@gmail.com>
Date: Sun, 28 Apr 2019 20:31:19 +0700
Subject: [PATCH] Fixed merging with self bug.

---
 Src/Newtonsoft.Json.Tests/Linq/MergeTests.cs | 8 ++++++++
 Src/Newtonsoft.Json/Linq/JContainer.cs       | 2 ++
 2 files changed, 10 insertions(+)

diff --git a/Src/Newtonsoft.Json.Tests/Linq/MergeTests.cs b/Src/Newtonsoft.Json.Tests/Linq/MergeTests.cs
index 6c86b8a3..0a4c7331 100644
--- a/Src/Newtonsoft.Json.Tests/Linq/MergeTests.cs
+++ b/Src/Newtonsoft.Json.Tests/Linq/MergeTests.cs
@@ -46,6 +46,14 @@ namespace Newtonsoft.Json.Tests.Linq
     [TestFixture]
     public class MergeTests : TestFixtureBase
     {
+        [Test]
+        public void MergeSelf()
+        {
+            var a = new JArray { "1", "2" };
+            a.Merge(a, new JsonMergeSettings { MergeArrayHandling = MergeArrayHandling.Replace });
+            Assert.AreEqual(a, new JArray { "1", "2" });
+        }
+
         [Test]
         public void MergeNullString()
         {
diff --git a/Src/Newtonsoft.Json/Linq/JContainer.cs b/Src/Newtonsoft.Json/Linq/JContainer.cs
index f1d8ed09..3e1a6449 100644
--- a/Src/Newtonsoft.Json/Linq/JContainer.cs
+++ b/Src/Newtonsoft.Json/Linq/JContainer.cs
@@ -1164,6 +1164,8 @@ namespace Newtonsoft.Json.Linq
 #endif
                     break;
                 case MergeArrayHandling.Replace:
+                    if (target == content)
+                        break;
                     target.ClearItems();
                     foreach (JToken item in content)
                     {