SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: UPDATE bb1_guthaben_bank SET akt_jahr='2024', crashtag='108', boersencrash='0',boersencrashdate = '', boersencrashaktienwert='', boersencrashprozent='',boersencrashaktienwertneu='' WHERE bankid='1'
mysql error: Incorrect integer value: '' for column `web8_corelith_db`.`bb1_guthaben_bank`.`boersencrashaktienwert` at row 1
mysql error number: 1366
mysql version: 10.5.23-MariaDB-0+deb11u1
php version: 5.6.40
Date: 28.03.2024 @ 08:09
Script: /board.php?boardid=40&sid=d4d1d544053c09c42388a4581b4e838f
Referer: