I know v0.9.9 is probably the most recent version of Sigil in your repo, but it's actually quite old compared to the most recent version of Sigil (0.9.17). Even if there is a bug in that version of Sigil's codebase, we wouldn't be able to fix it in a way that would be useful to you.
As to how to possibly recover the contents of the epub in question: epubs are just specially structured zip files. Back it up somewhere, unzip it (might have to change the file extension to .zip for your archive manager to work with it) and take a look a look at the html code at the area in question in that particular file mentioned in the error. Maybe the code in question can be hand edited to fix the problem. Either way, any of the other xhtml files can be imported into a new Sigil epub. Even the contents of the problematic one can be pasted into a new file in Sigil's Code View. Just stay away from the problematic code that triggers the error.
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