SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6): Invalid SQL: UPDATE bb1_guthaben_bank SET akt_jahr='2025', crashtag='145', 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: 10.5.26-MariaDB-0+deb11u2
php version: 5.6.40-0+deb8u12
Date: 19.01.2025 @ 00:34
Script: /register.php?sid=78dcf73a3564688d2efa0ec8b298e230
Referer: