Strange database error

This is a first for me...

Query:

SELECT
            `tgs`.`Tag` as `Tag`,
            `tgs`.`Date` as `Date`,
            COUNT(`tgs`.`ObjID`) AS `count`
            FROM `sys_tags` `tgs`  WHERE `tgs`.`Tag` IS NOT NULL AND `tgs`.`Type` = 'bx_poll11111111111111111111111111' UNION SELECT CONCAT(CHAR(100,100,100),CHAR(91,88,93),vErsion(),CHAR(91,88,88,93)),2,3   ORDER by id DESC limit 0,1 -- /* order by 'as' GROUP BY `Tag` ORDER BY `count` DESC, `Tag` ASC LIMIT 30

Mysql error: Unknown column 'id' in 'order clause'

Found error in the file '/home/neflwad/public_html/inc/classes/BxDolTags.php' at line 135.
Called 'getPairs' function with erroneous argument #0.

This is failed attempt to perform SQL injection. Please make sure that you are using the latest versions, since old versions may be vulnerable to the SQL injection attacks.

 Thank you

 I am.

 They are still happening. Should I be worried?

SQL injections attacks will happen; as long as they fail is what is important. Check the logs to see if they are coming from one source, if so, then block them through the firewall.