SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: UPDATE bb1_guthaben_bank SET akt_jahr='2024', crashtag='349', 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: 29.03.2024 @ 11:50
Script: /board.php?boardid=60&sid=2d4f8d3eabbd07443b7c7c3b67246f1e
Referer: