1) open Sigil to the default empty epub template ()
2) configure Sigil so the Book Browser widget is displaying in the left dock area, and the Table of Contents widget is displaying in the right dock area, and the html is displaying in Code View. No Preview Widget window should be open.
3) open the attached "crashtest.epub" using File Open
4) immediately after opening, expand the Style group in the Book Browser and double click "Style0001.css" so that it opens a new tab in Code View
5) click (single) "Chapter Two" in the Table of Content widget so that a new html tab opens
6) right-click on "Section0002.xhtml" in the Book Browser and select "Delete". Confirm that you want to delete the marked file.
7) immediately run Tools->Delete Unused Style Classes and confirm that you want to delete the marked style (named p.deleteme).
Mine crashes after step #7, @stumped seems to need to click "Save" to get it to crash.
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