SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: UPDATE bb1_guthaben_bank SET akt_jahr='2025', crashtag='176', boersencrash='0',boersencrashdate = '', boersencrashaktienwert='', boersencrashprozent='',boersencrashaktienwertneu='' WHERE bankid='1'
mysql error: Incorrect integer value: '' for column `web467_1`.`bb1_guthaben_bank`.`boersencrashaktienwert` at row 1
mysql error number: 1366
mysql version: 10.5.29-MariaDB-0+deb11u1
php version: 5.6.40-0+deb8u12
Date: 08.07.2025 @ 17:16
Script: /login.php?sid=d671fc8cec1f9d63b48c8aa22ab7ffb2
Referer: