diff --git a/com.unity.netcode.gameobjects/Editor/CodeGen/CodeGenHelpers.cs b/com.unity.netcode.gameobjects/Editor/CodeGen/CodeGenHelpers.cs
index 0f28e01783..e1900e407c 100644
--- a/com.unity.netcode.gameobjects/Editor/CodeGen/CodeGenHelpers.cs
+++ b/com.unity.netcode.gameobjects/Editor/CodeGen/CodeGenHelpers.cs
@@ -155,7 +155,7 @@ public static MethodReference MakeGeneric(this MethodReference self, params Type
         public static bool IsSubclassOf(this TypeReference typeReference, TypeReference baseClass)
         {
             var type = typeReference.Resolve();
-            if (type.BaseType == null || type.BaseType.Name == nameof(Object))
+            if (type == null || type.BaseType == null || type.BaseType.Name == nameof(Object))
             {
                 return false;
             }