From 10d9a6ad3e5c23da7f5762cf844818997e9a327a Mon Sep 17 00:00:00 2001
From: Isha Bansal <ibansal@twilio.com>
Date: Tue, 20 Sep 2022 16:42:26 +0530
Subject: [PATCH] handling null object value

---
 src/Twilio/Converters/PhoneNumberConverter.cs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/Twilio/Converters/PhoneNumberConverter.cs b/src/Twilio/Converters/PhoneNumberConverter.cs
index ba158463d..c04143a95 100644
--- a/src/Twilio/Converters/PhoneNumberConverter.cs
+++ b/src/Twilio/Converters/PhoneNumberConverter.cs
@@ -17,7 +17,9 @@ public class PhoneNumberConverter : JsonConverter
         /// <param name="serializer">unsued</param>
         public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
         {
-            var t = JToken.FromObject(value.ToString());
+            var t = value.ToString() != null
+                                            ? JToken.FromObject(value.ToString())
+                                            : JValue.CreateNull();
             t.WriteTo(writer);
         }