Crib bumper dilemma - safety vs head knocks

I’m a bit in a dilemma right now. Baby started to stand in her crib a few days ago and she’s so excited that she’ll try to stand up whenever we put her in the crib. As she’s still trying to get her balance she often falls back in her crib. I try to watch her as much as I can to make sure she doesn’t knock her head but she’s just so quick. I’ve been reading bumper isn’t recommended and I do want to avoid having it, but my bub knocks her head at least once a day. Depending on how hard the knock was sometimes she’ll cry. Advice anyone?