I have a DRM free Harry Potter combined ebook (from the now defunct pottermore) which won't import on lingq, and fails with the error 'Importing failed - 'NoneType' object has no attribute 'content'

Importing book 1 as an individual epub (also from pottermore) imports without error, so I suspect there's something to do with the formatting.

I believe I can probably extract the text myself using python and ebooklib, but I thought I'd ask if there are any lingq workarounds first.