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And that crash will happen with any epub opening warnings that do not have "details" in the warning message. Missing NCX or broken NCX is one of those warnings detected when opening an epub that includes no extra "details", so it causes a crash.
This bug was reported and fixed over the weekend. The fix is already in Sigil master. And we are planning a fast Sigil 2.3.1 release hopefully within the next week or so.
Unless you build your own, the only workaround is to use an earlier Sigil release or make sure your epub NCX is correctly specified in an epub2.
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