Be careful. Not everything is meant to be sealed. For instance, people with rubble stone foundations (not hat you have one) always post on here about sealing foundation walls which in some instances could spell disaster. In certain applications you want moisture (not flowing water obviously) to be able to pass through so that it doesn’t build up pressure behind the wall. Also, with something like you have pictured here, that may have been done that way to allow flexibility for shifting. I wouldn’t just go about it Willy Nilly. Look around and see what the purpose of that might have been. There may be no purpose and it may just be sloppiness, but bottom line is, don’t assume it’s wrong the way that it is. The dirt looks a little darker at the bottom of the photo there. Is that moisture?