SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6 pl2): Invalid SQL: INSERT INTO bb1_statistics VALUES ('1606712559', '', '', '', '', '', '')
mysql error: Incorrect integer value: '' for column `admin_galaxy_1`.`bb1_statistics`.`threads` at row 1
mysql error number: 1366
mysql version: 10.2.36-MariaDB
php version: 5.3.29
Date: 30.11.2020 @ 06:02
Script: /wbb2/forgotpw.php
Referer: