Notice: Undefined index: user_id in /www_root/mypage/log_out_exe.php on line 6

Fatal error: Uncaught PDOException: SQLSTATE[23000]: Integrity constraint violation: 1048 Column 'user_id' cannot be null in /www_root/php/conf.function.php:433 Stack trace: #0 /www_root/php/conf.function.php(433): PDOStatement->execute() #1 /www_root/mypage/log_out_exe.php(6): eventHistory(NULL, 9) #2 {main} thrown in /www_root/php/conf.function.php on line 433