Comment 2 for bug 1666205

StacktraceTop:
 get_start_of_week (date=0x0) at gcal-utils.c:534
 gcal_week_header_add_event (self=0x5610786fa140, event=0x561078987dc0) at views/gcal-week-header.c:1580
 cal_data_model_add_to_subscriber (data_model=data_model@entry=0x56107617c1c0, client=<optimized out>, id=<optimized out>, component=<optimized out>, instance_start=<optimized out>, instance_end=<optimized out>, user_data=0x56107634d350) at e-cal-data-model.c:1740
 cal_data_model_foreach_component (data_model=data_model@entry=0x56107617c1c0, in_range_start=in_range_start@entry=1486940400, in_range_end=in_range_end@entry=1487545200, func=func@entry=0x561074b1cd40 <cal_data_model_add_to_subscriber>, user_data=user_data@entry=0x56107634d350, include_lost_components=include_lost_components@entry=1) at e-cal-data-model.c:2565
 e_cal_data_model_subscribe (data_model=0x56107617c1c0, subscriber=0x56107634d350, range_start=1486940400, range_end=1487545200) at e-cal-data-model.c:2761