diff --git a/Facepunch.Steamworks/Interop/Native.cs b/Facepunch.Steamworks/Interop/Native.cs
index 8cd5d5a..c59902f 100644
--- a/Facepunch.Steamworks/Interop/Native.cs
+++ b/Facepunch.Steamworks/Interop/Native.cs
@@ -47,6 +47,9 @@ namespace Facepunch.Steamworks.Interop
 
             FillInterfaces( steamworks, hUser, hPipe );
 
+            if ( !user.IsValid )
+                return false;
+
             // Ensure that the user has logged into Steam. This will always return true if the game is launched
             // from Steam, but if Steam is at the login prompt when you run your game it will return false.
             if ( !user.BLoggedOn() )
diff --git a/Generator/CodeWriter/PlatformClass.cs b/Generator/CodeWriter/PlatformClass.cs
index 14473ad..2409263 100644
--- a/Generator/CodeWriter/PlatformClass.cs
+++ b/Generator/CodeWriter/PlatformClass.cs
@@ -19,7 +19,7 @@ namespace Generator
                 StartBlock( $"internal class {type} : Interface" );
                 {
                     WriteLine( "internal IntPtr _ptr;" );
-                    WriteLine( "public bool IsValid { get{ return _ptr != null; } }" );
+                    WriteLine( "public bool IsValid { get{ return _ptr != IntPtr.Zero; } }" );
                     WriteLine();
 
                     WriteLine( "//" );