I didn't even look at the buds.. ya, that's a nanner.. Not unusual to pop a few with some strains right up at the end.. Assuming all the plants are as far along, it shouldn't pose that much of an issue at 7 weeks into flowering.. clean the room with a light spray bleach next round in case any pollen might be straying around.. last minute nanners can and do happen..
Now if you have other plants at varying stages, you may want to isolate this one from them..