SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: SELECT t.* FROM bb1_threads t WHERE t.threadid = '115126'
mysql error: Out of resources when opening file './usr_web1_2/bb1_threads.MYD' (Errcode: 24)
mysql error number: 23
mysql version: 5.5.47-0+deb6u1-log
php version: 5.3.3-7+squeeze29
Date: 08.07.2020 @ 07:05
Script: /usercp.php?action=addsubscription&threadid=115126
Referer: