Doesn't crash, but sometimes apps seem to be created under the assumption their permission request isn't creating a popup, so there are sometimes like 10 in a row, so the user will often give up and just either blanket deny or accept
EDIT:an "allow for 10 min" option would resolve this
The lack of a "for 10 minutes"-type option is, IMO, the biggest failing of Privacy Guard. XPrivacy is better in that regard, but was harder to use overall when I last tried it.
XPrivacy does have the benefit of making it easy to provide realistic-looking fake data, which I believe the CyanogenMod team is against.
EDIT:an "allow for 10 min" option would resolve this