public void GetTraitForObject(int index, string traitClassName)
{
    var objectType = this.stack[index].GetType();
    var methodInfo = objectType.GetMethods().FirstOrDefault(m => m.Name == "Trait");

    if (methodInfo != null)
    {
        var assemblies = AppDomain.CurrentDomain.GetAssemblies();
        var traitType = assemblies.FirstOrDefault(a => a.GetType("OpenRA.Traits." + traitClassName) != null);

        if (traitType != null)
        {
            methodInfo.MakeGenericMethod(new Type[] { traitType });

            if (methodInfo.ReturnType != typeof(void))
            {
                object result = info.Invoke(obj, null); // << crash

                this.stack.Push(result);
            }
        }
    }
}