Dates before first event

In Agenda view I have the following issue.

I can click on left arrow (dates before actual view) near date-picker and it results some strange data. Its shown one date (out of my calendar) and all the existing events following this date.

But this date is out of my calendar (I even tried to strictly set up calendar start date). And of course I didn’t arrange any events to this date.

How can I limit this period chooser not to go earlier than the calendar start date or first event?

https://ww.wp.xz.cn/plugins/all-in-one-event-calendar/