lampe-gtk crash: unexpected localtime-format for schedules

Since today, when I launch lampe-gtk, I have:

(lampe-gtk:5757): GLib-CRITICAL **: g_strsplit: assertion 'string != NULL' failed
[1]    5757 segmentation fault (core dumped)  lampe-gtk

I have a window then it crashes immediately. If there is no .lamperc or no internet connection, it works.