As pointed out by foutrelis: lib/screenshooter-job-callbacks.c:397:16: warning: Dereference of null pointer (loaded from variable 'last_user') *last_user = g_strdup (last_user_temp); His suggestions are: 1) https://paste.xinu.at/lPS/ 2) https://paste.xinu.at/uVuglo/ The first one just avoids to deference an invalid pointer while the second seems one tackles the problem more properly. All in all, both suggestions require proper testing.
Not a bug anymore since ZimageZ support has been dropped: https://git.xfce.org/apps/xfce4-screenshooter/commit/?id=5fe8d89