What platform? Any message that comes with the crash? Sigil 0.9.9 actually has a bug fix to prevent just this bug that was fixed in 0.9.8 so stick with 0.9.9. Some new Windows boxes have the tmp directory default to be automatically emptied and this can cause lots of crashes as Sigil makes heavy use of tmp files.
If it is legal to post the problem epub2, please post it so that authors can try to recreate the issue.
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