How can I fix this "error" in phpmyadmin ? Is this a serious problem, I should care about? 

 - Server Version: 10.0.20-MariaDB-1~trusty-log - mariadb.org binary
 - distribution Apache/2.4.7 (Ubuntu)
 - Datenbank-Client Version: libmysql 5.5.44
 - PHP-Erweiterung: mysqli Dokumentation

Thanks in advance!