Should be fixed a very long time ago (4 months after it was reported here) via https://github.com/kovidgoyal/calibre/commit/768bdc2d8eaee4728a6dfe29e917b048f7aeea0a
In the future, please consider trying to install the official prebuilt binaries at https://calibre-ebook.com/download_linux and seeing if the error can be duplicated; if you still get the error, then it's an upstream bug and can be reported to the calibre developer at https://calibre-ebook.com/bugs -- Eli Schwartz Arch Linux Bug Wrangler and Trusted User
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