 All right, so a couple of things. I'm a little concerned that you can see into the cracks to see the stone base underneath it. It may or may not be an issue. But what would be an issue is if you let a lot of water get in there from rain. If the water gets in, it's going to make the soil less stable, so you'll get settlement potentially. And then secondly, if you let a lot of water get in there, it'll freeze and then it'll expand, and that will make the cracks wider. So what I suggest you do is simply to caulk those cracks and use silicone.