Unfortunately that is one of the highest stress point of the rifle aside from the throat/chamber area. The job of that piece is to contain the cam pin and rotate to unlock the bolt. The cam pin happens to be the highest stress point of the bolt carrier group because it needs to violently unlock and rotate to begin the rear ward motion then when it slams back home, it has to lock the bolt back into place. That's a lot of stress to a small part area.
With that said, if you shown anything else having a small chip in it, I'd say maybe it is okay. But anything with the cam pin needs to be replaced ASAP. I also recommend in the future put more heavy lubrication into that area and also spend a bit more time cleaning that area. I always spend a bit of extra time focusing on the cam pin by putting extra amount of grease to cover the entire camp pin before putting it back into place.