SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: SELECT t.*, lto.* FROM `bb1_lcd_text` t LEFT JOIN `bb1_lcd_text_options` lto USING (lcdid) WHERE t.`languagepackid`='0' AND t.`showit`='1' ORDER BY t.orderno ASC
mysql error: Out of resources when opening file '/tmp/#sql_422_0.MAI' (Errcode: 24 "Too many open files")
mysql error number: 23
mysql version: 10.0.32-MariaDB-0+deb8u1
php version: 5.6.33-0+deb8u1
Date: 27.04.2024 @ 15:09
Script: /lcd.php
Referer: