g_date_time_difference: assertion 'begin != NULL' failed
Inspecting my journal for cleanliness, I see several warnings coming from GNOME Clocks that would be good to audit:
Apr 30 10:01:17 chargestone-cave gnome-clocks[21085]: g_date_time_difference: assertion 'begin != NULL' failed
Apr 30 10:01:17 chargestone-cave gnome-clocks[21085]: g_date_time_difference: assertion 'begin != NULL' failed
Apr 30 10:01:17 chargestone-cave gnome-clocks[21085]: g_date_time_difference: assertion 'begin != NULL' failed