After launching Audacity, selecting the autosave you might be greeted with a "not well formed - invalid token" error. That means the XML autosave is corrupted.
~/.audacity-data/AutoSave you will probably find an invalid file like so:
~/.audacity-data/AutoSave$ xmlstarlet val cryptoparty2.autosave cryptoparty2.autosave - invalid
Open the file in vim, go to the bottom with the
G shortcut and hopefully you will notice some obvious gibberish like:
Remove it, validate the XML is good. Now you should be able to open it in Audacity.