SQL-DATABASE ERROR

Database error in WoltLab Burning Board (): Link-ID == false, connect failed
mysql error: Too many connections
mysql error number: 1040
mysql version: unknown
php version: 5.4.4-14+deb7u14
Date: 04.12.2020 @ 06:46
Script: /forum/board.php?boardid=52&daysprune=1000&sortfield=starter&sortorder=ASC&page=3
Referer: