ResolveUsing is still executed when Condition fails

ConditionNotBeingHonoured.cs

using AutoMapper;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AutoMapperCondition
{
  class Program
  {
    static void Main(string[] args)
    {
      Mapper.Initialize(cfg =>
      {
        cfg.CreateMap<Source, Dest>()
           .ForMember(target => target.Codes, config =>
           {
             config.Condition(source => !string.IsNullOrWhiteSpace(source.Codes));
             config.ResolveUsing(source => source.Codes.Split(',').Select(code => code.Trim()));
           });
      });

      Source s = new Source();
      Dest d = Mapper.Instance.Map<Dest>(s);
      // Exected, valid instance of d with codes == null
      // Actual, null reference exception in ResolveUsing
    }

  }

  public class Source
  {
    public string Codes { get; set; }
  }

  public class Dest
  {
    public List<string> Codes { get; set; }
  }

}