Just for the record, I'm running kubuntu 18.04, sigil 0.9.9 (built from source) and loaded Qt 5.9.5, and I experience this crash.
I'm not sure why I never noticed it before, since every time I make an epub I generate a toc.xhtml (which ends up as the first file, of course) and move it down to just before the text of the book starts. (i.e. the end of the frontmatter). Now, that causes the crash as described above.
Might be because I only just recently ugraded kubuntu from 16.04.x to 18.04.1.
In any event, adding "XDG_CURRENT_DESKTOP=XFCE" to the sigil startup file fixes the problem.
Albert
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