Is it safe to use a drill bit with a half broken tip?
The fact that part of the bit has broken off does lead one to believe the rest of it may be in danger of disintegrating during use with the potential for bits of metal to go flying in unexpected directions.
Also, the fact that the point appears to be off-center means that you're going to have a hard time getting the bit centered where you want the hole to be and keeping it centered while drilling.
While masonry bits may not be the cheapest bit in the aisle, it seems that now would be a sensible time to replace this one.