diff --git a/sandbox/ConsoleApp/ConsoleApp.csproj b/sandbox/ConsoleApp/ConsoleApp.csproj
index 41f1d5a..9d80c7b 100644
--- a/sandbox/ConsoleApp/ConsoleApp.csproj
+++ b/sandbox/ConsoleApp/ConsoleApp.csproj
@@ -1,8 +1,13 @@
 <Project Sdk="Microsoft.NET.Sdk">
 
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>net6.0</TargetFramework>
-  </PropertyGroup>
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net6.0</TargetFramework>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <ProjectReference Include="..\..\src\ObservableCollections\ObservableCollections.csproj" />
+    </ItemGroup>
 
 </Project>
diff --git a/sandbox/ConsoleApp/Program.cs b/sandbox/ConsoleApp/Program.cs
index 23b8e79..c7c16e2 100644
--- a/sandbox/ConsoleApp/Program.cs
+++ b/sandbox/ConsoleApp/Program.cs
@@ -1,4 +1,5 @@
-using System;
+using ObservableCollections;
+using System;
 
 namespace ConsoleApp
 {
@@ -6,7 +7,8 @@ namespace ConsoleApp
     {
         static void Main(string[] args)
         {
-            Console.WriteLine("Hello World!");
+
+
         }
     }
 }
diff --git a/src/ObservableCollections/Internal/CloneCollection.cs b/src/ObservableCollections/Internal/CloneCollection.cs
index 4e9268e..9593574 100644
--- a/src/ObservableCollections/Internal/CloneCollection.cs
+++ b/src/ObservableCollections/Internal/CloneCollection.cs
@@ -22,6 +22,7 @@ namespace ObservableCollections.Internal
         {
             this.array = ArrayPool<T>.Shared.Rent(1);
             this.length = 1;
+            this.array[0] = item;
         }
 
         public CloneCollection(IEnumerable<T> source)