try
{
    foreach(Cop cop in nearbyCopList)
    {
        if (Exists(cop.ped) && Exists(cop.blip))
        {
            cop.blip.Color = BlipColor.Red;

                if (GTA.Native.Function.Call<bool>("HAS_CHAR_SPOTTED_CHAR_IN_FRONT", cop.ped, pc) && GTA.Native.Function.Call<bool>("HAS_CHAR_SPOTTED_CHAR_IN_FRONT", pc, cop.ped))
                {
                    // Some stuff
                }
        }
    }
}
catch (NullReferenceException ex)
{
    Game.Console.Print("WTF NO! lol");
}