add_option was called with an argument that is deprecated since version

Появилась ошибка на сайте: itsecforu.ru

До этого обновил плагин и страницы просто стали недоступны по ошибке 500.
Через ftp переименовал папку с плагином — теперь вижу в шапке код ошибки:

Notice: add_option was called with an argument that is deprecated since version 2.3.0 with no alternative available. in /home/srv55239/itsecforu.ru/wp-includes/functions.php on line 4026
Notice: add_option was called with an argument that is deprecated since version 2.3.0 with no alternative available. in /home/srv55239/itsecforu.ru/wp-includes/functions.php on line 4026
Notice: add_option was called with an argument that is deprecated since version 2.3.0 with no alternative available. in /home/srv55239/itsecforu.ru/wp-includes/functions.php on line 4026
Notice: add_option was called with an argument that is deprecated since version 2.3.0 with no alternative available. in /home/srv55239/itsecforu.ru/wp-includes/functions.php on line 4026
Notice: add_option was called with an argument that is deprecated since version 2.3.0 with no alternative available. in /home/srv55239/itsecforu.ru/wp-includes/functions.php on line 4026
Notice: add_option was called with an argument that is deprecated since version 2.3.0 with no alternative available. in /home/srv55239/itsecforu.ru/wp-includes/functions.php on line 4026
Notice: add_option was called with an argument that is deprecated since version 2.3.0 with no alternative available. in /home/srv55239/itsecforu.ru/wp-includes/functions.php on line 4026
Notice: add_option was called with an argument that is deprecated since version 2.3.0 with no alternative available. in /home/srv55239/itsecforu.ru/wp-includes/functions.php on line 4026
Notice: add_option was called with an argument that is deprecated since version 2.3.0 with no alternative available. in /home/srv55239/itsecforu.ru/wp-includes/functions.php on line 4026

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