From c22f43ed90e509e01d7bd1dd0bdd0fc3e5244394 Mon Sep 17 00:00:00 2001
From: "james.z" <james.zheng@sjfood.com>
Date: Wed, 28 Dec 2022 05:27:43 +0000
Subject: [PATCH] fix ReplaceRenderer class. Method Parse,
 NullReferenceException

---
 .../Defaults/ReplaceRenderer.cs               |  2 +-
 .../ReplaceRendererTest.cs                    | 25 +++++++++++++++++++
 2 files changed, 26 insertions(+), 1 deletion(-)
 create mode 100644 test/FluentEmail.Core.Tests/ReplaceRendererTest.cs

diff --git a/src/FluentEmail.Core/Defaults/ReplaceRenderer.cs b/src/FluentEmail.Core/Defaults/ReplaceRenderer.cs
index 1eb8799e..7065fe2b 100644
--- a/src/FluentEmail.Core/Defaults/ReplaceRenderer.cs
+++ b/src/FluentEmail.Core/Defaults/ReplaceRenderer.cs
@@ -10,7 +10,7 @@ public string Parse<T>(string template, T model, bool isHtml = true)
         {
             foreach (PropertyInfo pi in model.GetType().GetRuntimeProperties())
             {
-                template = template.Replace($"##{pi.Name}##", pi.GetValue(model, null).ToString());
+                template = template.Replace($"##{pi.Name}##", pi.GetValue(model, null)?.ToString());
             }
 
             return template;            
diff --git a/test/FluentEmail.Core.Tests/ReplaceRendererTest.cs b/test/FluentEmail.Core.Tests/ReplaceRendererTest.cs
new file mode 100644
index 00000000..29447ba8
--- /dev/null
+++ b/test/FluentEmail.Core.Tests/ReplaceRendererTest.cs
@@ -0,0 +1,25 @@
+using FluentEmail.Core.Defaults;
+using FluentEmail.Core.Interfaces;
+using FluentEmail.Core.Models;
+using NUnit.Framework;
+
+namespace FluentEmail.Core.Tests
+{
+    [TestFixture]
+    public class ReplaceRendererTest
+    {
+        [Test]
+        public void ModelPropertyValueIsNull_Test()
+        {
+            ITemplateRenderer templateRenderer = new ReplaceRenderer();
+
+            var address = new Address("james@test.com", "james");
+            Assert.True(address.Name == "james");
+            var template = "this is name: ##Name##";
+            Assert.True("this is name: james" == templateRenderer.Parse(template, address));
+
+            address.Name = null;
+            Assert.True("this is name: " == templateRenderer.Parse(template, address));
+        }
+    }
+}
\ No newline at end of file