Exception: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'log_users_id' cannot be null

Trace:
#0 /home/ticket/core/src/database/Database.class.php(114): PDOStatement->execute(Array)
#1 /home/ticket/core/src/database/Database.class.php(138): Database->execute(Array)
#2 /home/ticket/core/src/log/LogClickout.class.php(56): Database->query('INSERT INTO????...', Array)
#3 /home/ticket/core/src/log/Logger.class.php(9): LogClickout->log(Object(Database))
#4 /home/ticket/site/view/clickout.class.php(30): Logger->log(Object(LogClickout))
#5 /home/ticket/public_html/index.php(39): Clickout->__construct()
#6 {main}