To wrap up:
- Usage of singular verb in this case is mainstream
- Usage of plural verb is also possible, however much less frequent
- For a lerner of russian it's advisable, to always use singular in this case, this way you'll never go wrong, and don't have the risk to sound "unnatural", and in most cases you will sound unnatural if you use plural here.
- However it's good to be aware the plural usage, because it can occure in literature, even well known writers use it when they see fit.