Snapshot restore fails on 63%

Trying to do a managed backup restore using the snapshot-installer.php but it gets stuck and fails when it reaches 63% on tables chunk 15

http://www.mi+++++++od.com/snapshot-installer.php

https://cdn.livechat-static.com/api/file/v2/lc/att-old/8801096/54ba4e99634c4770d3280a4c14d12de4/Snapshot%20problem.JPG

On top of the message (outside of the sceeenshot) this message is shown:

Warning: Division by zero in /web/htdocs/www.mi++++++od.com/home/snapshot-installer.php on line 754