Editing poll: Display 2030 year as Expiration Date

Hello.
1) create poll and dont set "Expiration Date"
2) edit poll in frontend
Result: when editing poll it display "Expiration Date: 11.01.2030".

When I update (reSave) poll it display:

This poll closes on 11.01.2030

I don't want this poll to Expire in 2030 or someday. And I can't clear date field to remove it.

I suppose if during poll creation I didn't set "Expiration Date", so I should not see this "Expiration Date: 11.01.2030" during editing. To be precise date should be visible after I put some checkbox (agree to use it).

thanks.