The crash occurs when changing a new document with the navigation buttons (when you are in ereader mode after "opening" the OPF) and not when Sigil closes (it keeps the file in memory and is editable normally, but fails to save it).
PageEdit does not check the existing files when using the navigation buttons and therefore tried to load a non-existent one.
EDIT:
Quote:
Originally Posted by KevinH
I will try to add more file exists checks but deleting any resource as it is being actively loaded is going to still be an issue.
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I understand that verifying (other than at the time of saving) the existence of the currently loaded document is unnecessarily complex and exaggerated (and useless since it cannot be saved).
PS: One click before the crash: