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: 10.1.22-MariaDB
php version: 5.4.16
Date: 24.09.2017 @ 12:16
Script: /u4u/wbb2/jgs_db.php?sid=f099087662cd4d59e8c16a1ba1a9841d
Referer: