SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: UPDATE bb1_guthaben_bank SET akt_jahr='2024', crashtag='75', 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 @ 19:27
Script: /usercp.php?action=buddy&add=18&sid=cbe7c4a4ea1c30b4fa37c6d3e97b8530
Referer: