folks_favourite_details_get_is_favourite: assertion 'self != NULL' failed
This kind of assertion failures appear sometimes:
apr 29 09:27:30 pureos gnome-contacts[2064]: folks_favourite_details_get_is_favourite: assertion 'self != NULL' failed
apr 29 09:27:30 pureos gnome-contacts[2064]: folks_favourite_details_get_is_favourite: assertion 'self != NULL' failed
Happens on a Librem 5 running PureOS with gnome-contacts version 43.beta.