Might want to provide more details to your issue, since 0.7.7 in pve repos has been deemed safe.
Read more here:
https://pve.proxmox.com/pipermail/pve-user/2018-April/169432.html
yeah, but I had to run dpkg reconfigure -a to make zfs working. But since it worked for me - thank's to everyone who spent time on reading this post )