Need Help about hacking

[tanzeelniazi]

Hello all i have a problem today i got so many email about database errors
i think someone try to hack but fail not complete sure
i got this emails

Database error in vBulletin 4.2.0:

Invalid SQL:

                SELECT post.postid, post.threadid, post.visible, post.title, post.userid,
                        thread.forumid, thread.title AS thread_title, thread.postuserid, thread.visible AS thread_visible, thread.firstpostid
                FROM post AS post
                LEFT JOIN thread AS thread USING (threadid)
                WHERE postid IN (1) AND 81 44 AND (7397=7397);

MySQL Error   : You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '44 AND (7397=7397)' at line 5
Error Number  : 1064
Request Date  : Monday, July 18th 2016 @ 07:03:58 PM
Error Date    : Monday, July 18th 2016 @ 07:03:58 PM
Script        : http://www.XXXXXX.com/forumrunner/request.php
Referrer      :
IP Address    : 18*.6*.1**.**9
Username      : Unregistered
Classname     : **_******_MySQLi
MySQL Version :

Database error in vBulletin 4.2.0:

Invalid SQL:

                SELECT post.postid, post.threadid, post.visible, post.title, post.userid,
                        thread.forumid, thread.title AS thread_title, thread.postuserid, thread.visible AS thread_visible, thread.firstpostid
                FROM post AS post
                LEFT JOIN thread AS thread USING (threadid)
                WHERE postid IN (1) AND (SELECT CHAR(122)||CHAR(107)||CHAR(75)||CHAR(66) FROM INFORMATION_SCHEMA.SYSTEM_USERS)=CHAR(122)||CHAR(107)||CHAR(75)||CHAR(66) AND (7852=7852);

MySQL Error   : Unknown table 'SYSTEM_USERS' in information_schema
Error Number  : 1109
Request Date  : Monday, July 18th 2016 @ 07:04:18 PM
Error Date    : Monday, July 18th 2016 @ 07:04:19 PM
Script        : http://www.XXXXX.com/forumrunner/request.php
Referrer      :
IP Address    : 18*.6*.1**.**9
Username      : Unregistered
Classname     : **_******_MySQLi
MySQL Version :

Database error in vBulletin 4.2.0:

Invalid SQL:

                SELECT post.postid, post.threadid, post.visible, post.title, post.userid,
                        thread.forumid, thread.title AS thread_title, thread.postuserid, thread.visible AS thread_visible, thread.firstpostid
                FROM post AS post
                LEFT JOIN thread AS thread USING (threadid)
                WHERE postid IN (1) AND (SELECT CHAR(122)||CHAR(107)||CHAR(75)||CHAR(66) FROM INFORMATION_SCHEMA.SYSTEM_USERS)=CHAR(122)||CHAR(107)||CHAR(75)||CHAR(66) AND (7852=7852);

MySQL Error   : Unknown table 'SYSTEM_USERS' in information_schema
Error Number  : 1109
Request Date  : Monday, July 18th 2016 @ 07:04:18 PM
Error Date    : Monday, July 18th 2016 @ 07:04:19 PM
Script        : http://www.XXXXXX.com/forumrunner/request.php
Referrer      :
IP Address    : 18*.6*.1**.**9
Username      : Unregistered
Classname     : **_******_MySQLi
MySQL Version :

and some other types of database errors
Some one try to hack me ?
Someone got my database ?
any help