birthdays-widget-ajax-callback.php on line 52

Hello

Ive installed widjet. After install I activet it in admin pannel. And I have errors on the page:

Warning: Creating default object from empty value in /home/h910233344/mgpsh.ru/docs/wp-content/plugins/birthdays-widget/birthdays-widget-ajax-callback.php on line 52

Warning: count(): Parameter must be an array or an object that implements Countable in /home/h910233344/mgpsh.ru/docs/wp-content/plugins/birthdays-widget/class-birthdays-widget-settings.php on line 1423

Warning: Invalid argument supplied for foreach() in /home/h910233344/mgpsh.ru/docs/wp-content/plugins/birthdays-widget/class-birthdays-widget-settings.php on line 1424

Screenshot: https://drive.google.com/file/d/1mQYQxCyBOJwNBn_eBsogSiYZS2pCdfWc/view?usp=sharing

Please help.