SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: SELECT * FROM bb1_sponsoren WHERE showsponsor_b = '1' AND sponsorpartner = '0' ORDER BY RAND() DESC
mysql error: Disk full (/tmp/#sql_1fe_0.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
mysql error number: 1021
mysql version: 10.3.39-MariaDB-0ubuntu0.20.04.2
php version: 5.5.38
Date: 30.04.2025 @ 21:08
Script: /board.php?boardid=7
Referer: