SQL-DATABASE ERROR

Database error in WoltLab Burning Board (2.3.6 pl2): Invalid SQL: SELECT count(*) FROM bb2_jgs_db_eintrag WHERE userid =
mysql error: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '' at line 1
mysql error number: 1064
mysql version: 10.2.9-MariaDB
php version: 5.4.16
Date: 22.10.2017 @ 10:06
Script: /u4u/wbb2/jgs_db.php?sid=3fadb4a3c8eac5f1ce542116bb19675f
Referer: