diff --git a/Src/Newtonsoft.Json.Tests/JsonTextWriterTest.cs b/Src/Newtonsoft.Json.Tests/JsonTextWriterTest.cs
index b3bdd4d9..f0c46233 100644
--- a/Src/Newtonsoft.Json.Tests/JsonTextWriterTest.cs
+++ b/Src/Newtonsoft.Json.Tests/JsonTextWriterTest.cs
@@ -945,13 +945,15 @@ namespace Newtonsoft.Json.Tests
                 jsonWriter.WriteToken(JsonToken.StartArray);
                 jsonWriter.WriteToken(JsonToken.Integer, 1);
                 jsonWriter.WriteToken(JsonToken.StartObject);
-                jsonWriter.WriteToken(JsonToken.PropertyName, "string");
+                jsonWriter.WriteToken(JsonToken.PropertyName, "integer");
                 jsonWriter.WriteToken(JsonToken.Integer, int.MaxValue);
+                jsonWriter.WriteToken(JsonToken.PropertyName, "null-string");
+                jsonWriter.WriteToken(JsonToken.String, null);
                 jsonWriter.WriteToken(JsonToken.EndObject);
                 jsonWriter.WriteToken(JsonToken.EndArray);
             }
 
-            Assert.AreEqual(@"[1,{""string"":2147483647}]", sb.ToString());
+            Assert.AreEqual(@"[1,{""integer"":2147483647,""null-string"":null}]", sb.ToString());
         }
 
         [Test]
diff --git a/Src/Newtonsoft.Json.Tests/Linq/JTokenWriterTest.cs b/Src/Newtonsoft.Json.Tests/Linq/JTokenWriterTest.cs
index d8d7dbe5..18d195eb 100644
--- a/Src/Newtonsoft.Json.Tests/Linq/JTokenWriterTest.cs
+++ b/Src/Newtonsoft.Json.Tests/Linq/JTokenWriterTest.cs
@@ -392,5 +392,28 @@ namespace Newtonsoft.Json.Tests.Linq
 
             Assert.AreEqual(new DateTime(2000, 1, 1, 1, 1, 1, DateTimeKind.Utc), dt);
         }
+
+        [Test]
+        public void WriteTokenDirect()
+        {
+            JToken token;
+
+            using (JTokenWriter jsonWriter = new JTokenWriter())
+            {
+                jsonWriter.WriteToken(JsonToken.StartArray);
+                jsonWriter.WriteToken(JsonToken.Integer, 1);
+                jsonWriter.WriteToken(JsonToken.StartObject);
+                jsonWriter.WriteToken(JsonToken.PropertyName, "integer");
+                jsonWriter.WriteToken(JsonToken.Integer, int.MaxValue);
+                jsonWriter.WriteToken(JsonToken.PropertyName, "null-string");
+                jsonWriter.WriteToken(JsonToken.String, null);
+                jsonWriter.WriteToken(JsonToken.EndObject);
+                jsonWriter.WriteToken(JsonToken.EndArray);
+
+                token = jsonWriter.Token;
+            }
+
+            Assert.AreEqual(@"[1,{""integer"":2147483647,""null-string"":null}]", token.ToString(Formatting.None));
+        }
     }
 }
\ No newline at end of file
diff --git a/Src/Newtonsoft.Json/JsonWriter.cs b/Src/Newtonsoft.Json/JsonWriter.cs
index d9121f61..a68fc8c4 100644
--- a/Src/Newtonsoft.Json/JsonWriter.cs
+++ b/Src/Newtonsoft.Json/JsonWriter.cs
@@ -579,8 +579,9 @@ namespace Newtonsoft.Json
                     }
                     break;
                 case JsonToken.String:
-                    ValidationUtils.ArgumentNotNull(value, nameof(value));
-                    WriteValue(value.ToString());
+                    // Allow for a null string. This matches JTokenReader behavior which can read
+                    // a JsonToken.String with a null value.
+                    WriteValue(value?.ToString());
                     break;
                 case JsonToken.Boolean:
                     ValidationUtils.ArgumentNotNull(value, nameof(value));