Database Error when Searching

[QSTR]

@master

I have the same error.
If I type in search 'dac diy' as unregistered user.... and I switch to the second page, voila:

PHP Code:

SELECT post.*,userfield.*, usertextfield.*, user.*, IF(displaygroupid=0, user.usergroupid, displaygroupid) AS displaygroupid,avatar.avatarpath, NOT ISNULL(customavatar.userid) AS hascustomavatar,
                        customavatar.dateline AS avatardateline, customavatar.width AS width, customavatar.height AS height,
                        customavatar.height_thumb AS height_thumb, customavatar.width_thumb AS width_thumb, customavatar.filedata_thumb
            FROM post AS post
                LEFT JOIN user AS user ON (user.userid = post.userid)
LEFT JOIN userfield AS userfield ON (user.userid = userfield.userid)
LEFT JOIN usertextfield AS usertextfield ON (user.userid = usertextfield.userid)
LEFT JOIN avatar AS avatar ON (avatar.avatarid = user.avatarid)
LEFT JOIN customavatar AS customavatar ON (customavatar.userid = post.userid)
            WHERE post.postid IN (.); 


vb 4.2.3, hooks disabled
No susp. files found.

PM with your plugins/products list. We can compare them.

Thanks.

--------------- Added [DATE]1449689399[/DATE] at [TIME]1449689399[/TIME] ---------------

Soo, I spent a half day with this, and I got something - so, what I did:
- copy of my PRD -> TEST, 1:1
- all non standard plugins/products -> DELETE
- cron jobs -> DISABLED
- overwrite vB files -> DONE
- check susp. files and delete non vB files -> DONE
- create new, clean style -> DONE
and.... what, nothing....

But - the funny thing now.
I didn't want to lose my time for Human Verfication, so I went to CP and disabled this function.
And... haha. Its working!

When I enable 'Human Verification' (Q&A) it crashes my board when I'm searching fe. 'dac diy' - of course I have to switch to the second page (or further)

@VB support - I can share You my board with files/db (with wiped passwords / emails / etc.) for tests.