Question2Answer query failed:

(SELECT '0' AS selectkey, qa_posts.postid, qa_posts.categoryid, qa_posts.type, LEFT(qa_posts.type, 1) AS basetype, INSTR(qa_posts.type, '_HIDDEN')>0 AS hidden, qa_posts.acount, qa_posts.selchildid, qa_posts.closedbyid, qa_posts.upvotes, qa_posts.downvotes, qa_posts.netvotes, qa_posts.views, qa_posts.hotness, qa_posts.flagcount, qa_posts.title, qa_posts.tags, UNIX_TIMESTAMP(qa_posts.created) AS created, qa_categories.title AS categoryname, qa_categories.backpath AS categorybackpath, qa_posts.userid, qa_posts.cookieid, INET_NTOA(qa_posts.createip) AS createip, qa_userpoints.points, qa_users.flags, qa_users.level, qa_users.email AS email, qa_users.handle AS handle, qa_users.avatarblobid, qa_users.avatarwidth, qa_users.avatarheight, NULL AS obasetype, NULL AS ohidden, NULL AS opostid, NULL AS ouserid, NULL AS ocookieid, NULL AS oip, NULL AS otime, NULL AS oflagcount, NULL AS oflags, NULL AS olevel, NULL AS oemail, NULL AS ohandle, NULL AS oavatarblobid, NULL AS oavatarwidth, NULL AS oavatarheight, NULL AS opoints, NULL AS parentid, NULL AS qcount, NULL AS position, NULL AS childcount, NULL AS content, NULL AS backpath, NULL AS pageid, NULL AS permit, NULL AS nav, NULL AS heading, NULL AS widgetid, NULL AS place FROM qa_posts LEFT JOIN qa_categories ON qa_categories.categoryid=qa_posts.categoryid LEFT JOIN qa_users ON qa_posts.userid=qa_users.userid LEFT JOIN qa_userpoints ON qa_posts.userid=qa_userpoints.userid JOIN (SELECT postid FROM qa_posts WHERE catidpath1=(SELECT categoryid FROM qa_categories WHERE backpath='как-сделать-php-код-быстрее'Q' LIMIT 1) AND type=$ ORDER BY qa_posts0c20eated DESC LIMIT #,#) y ON qa_posts.postid=y.postid) UNION ALL (SELECT '1', qa_posts.postid, qa_posts.categoryid, qa_posts.type, LEFT(qa_posts.type, 1), INSTR(qa_posts.type, '_HIDDEN')>0, qa_posts.acount, qa_posts.selchildid, qa_posts.closedbyid, qa_posts.upvotes, qa_posts.downvotes, qa_posts.netvotes, qa_posts.views, qa_posts.hotness, qa_posts.flagcount, qa_posts.title, qa_posts.tags, UNIX_TIMESTAMP(qa_posts.created), qa_categories.title, qa_categories.backpath, qa_posts.userid, qa_posts.cookieid, INET_NTOA(qa_posts.createip), qa_userpoints.points, qa_users.flags, qa_users.level, qa_users.email, qa_users.handle, qa_users.avatarblobid, qa_users.avatarwidth, qa_users.avatarheight, LEFT(aposts.type, 1), INSTR(aposts.type, '_HIDDEN')>0, aposts.postid, aposts.userid, aposts.cookieid, INET_NTOA(aposts.createip), UNIX_TIMESTAMP(aposts.created), aposts.flagcount, ausers.flags, ausers.level, ausers.email, ausers.handle, BINARY ausers.avatarblobid, ausers.avatarwidth, ausers.avatarheight, auserpoints.points, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL FROM qa_posts LEFT JOIN qa_categories ON qa_categories.categoryid=qa_posts.categoryid LEFT JOIN qa_users ON qa_posts.userid=qa_users.userid LEFT JOIN qa_userpoints ON qa_posts.userid=qa_userpoints.userid JOIN qa_posts AS aposts ON qa_posts.postid=aposts.parentid LEFT JOIN qa_users AS ausers ON aposts.userid=ausers.userid LEFT JOIN qa_userpoints AS auserpoints ON aposts.userid=auserpoints.userid JOIN (SELECT postid FROM qa_posts WHERE catidpath1=(SELECT categoryid FROM qa_categories WHERE backpath='как-сделать-php-код-быстрее'A' LIMIT 1) AND type=$ ORDER BY qa_posts0c50eated DESC LIMIT #,#) y ON aposts.postid=y.postid WHERE qa_posts.type='Q') UNION ALL (SELECT '2', NULL, qa_categories.categoryid, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, qa_categories.title, qa_categories.tags, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, qa_categories.parentid, qa_categories.qcount, qa_categories.position, COUNT(child.categoryid), qa_categories.content, qa_categories.backpath, NULL, NULL, NULL, NULL, NULL, NULL FROM qa_categories JOIN (SELECT NULL AS parentkey UNION SELECT grandparent.parentid FROM qa_categories JOIN qa_categories AS parent ON qa_categories.parentid=parent.categoryid JOIN qa_categories AS grandparent ON parent.parentid=grandparent.categoryid WHERE qa_categories.backpath='как-сделать-php-код-быстрее' UNION SELECT parent.parentid FROM qa_categories JOIN qa_categories AS parent ON qa_categories.parentid=parent.categoryid WHERE qa_'как-сделать-php-код-быстрее'ategories.backpath=$ UNION SELECT par'как-сделать-php-код-быстрее'ntid FROM qa_categories WHERE backpath='как-сделать-php-код-быстрее' UNION SELECT categoryid FROM qa_categories WHERE backpath=$) y ON qa_categories.parentid<=>parentkey LEFT JOIN qa_categories AS child ON child.parentid=qa_categories.categoryid GROUP BY qa_categories.categoryid ORDER BY qa_categories.position) UNION ALL (SELECT '3', NULL, categoryid, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL FROM qa_categories WHERE backpath='как-сделать-php-код-быстрее') UNION ALL (SELECT '5', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, title, tags, NULL, NULL, NULL, NULL, NULL, NULL, NULL, flags, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, position, NULL, content, NULL, pageid, permit, nav, heading, NULL, NULL FROM qa_pages WHERE tags='как-сделать-php-код-быстрее') UNION ALL (SELECT 'pending_navpages', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, title, tags, NULL, NULL, NULL, NULL, NULL, NULL, NULL, flags, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, position, NULL, NULL, NULL, pageid, permit+0, nav, heading, NULL, NULL FROM qa_pages WHERE nav IN ('B','M','O','F') ORDER BY position) UNION ALL (SELECT 'pending_widgets', NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, title, tags, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, position, NULL, NULL, NULL, NULL, NULL, NULL, NULL, widgetid, place FROM qa_widgets ORDER BY position)

Error 1064: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'Q' LIMIT 1) AND type=$ ORDER BY qa_posts0c20eated DESC LIMIT #,#) y ON qa_posts.' at line 1