Dear Antonio, thanks for the crash report! I can reproduce it easily with unstable distribution and the call stack points to pango_font_description_to_string method.
The issues seems to have been already reported upstream [1] and the suggested worj around is to add "font_name = Sans 11" in the [browser] section of the ~/.config/gtg/gtg.conf config file. I've checked the fix and no more crash occurs, so it could be integrated as a quilt patch for the Debian package. Best Regards, François [1] https://github.com/getting-things-gnome/gtg/issues/961#issuecomment-1475321154
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