Updated MySQL from 5.1 to 5.5, Intermittent Error

[mscottralston]

Hi folks,

I'm occasionally getting the following error on my forums after my server updated MySQL from 5.1 to 5.5:

PHP Code:

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)union);

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 ')' at line 5
Error Number  : 1064
Request Date  : Friday, November 18th 2016 @ 05:16:52 AM
Error Date    : Friday, November 18th 2016 @ 05:16:53 AM
Script        : [url]http://removed.com/http://removed.com/forumrunner/request.php?d=1&cmd=get_spam_data&postids=-1)union[/url]
Referrer      :
IP Address    : 185.2.32.2
Username      : Unregistered
Classname     : vB_Database
MySQL Version : 


I'd love some advice, please! Clearly something is no longer valid in the new version of SQL, but I'm not sure where in vBulletin to edit the syntax, nor what I should be editing it to (some kind of bracketing issue, I'm guessing).