They only need 51 for a quorum and therefore only 35 for a valid vote.
Thats not going to happen. Its going to take 67 votes to get the Law of the Sea or the small arms treaty passed and there are not 67 votes in existence.
If you are that worried about it then call your senators and make sure they know which way to vote. I’m not worried about it and I’m still going to call my 2 potted plants.