Since upgrade to colord-sane 1.4.7-1
systemd-coredump[]: Process 838 (colord-sane) of user 968 dumped core
EDIT: gone back to stable, removed everything to do with “sane” and downgraded.
==> error gone, but is no solution. Packets now excluded from update.
==> I have an HP-ENVY Photo 6230 (Printer/Scanner)