SQL-DATABASE ERROR

Database error in WoltLab Burning Board: Invalid SQL: SELECT p.postid FROM bb449_posts p, bb449_threads t WHERE p.threadid=t.threadid AND p.visible=1 AND p.posttime>'1596556720'
mysql error: Out of resources when opening file './fh_boxercup/bb449_threads.MYD' (Errcode: 24)
mysql error number: 23
Date: 05.08.2020 @ 17:58
Script: /search.php?action=24h
Referer: