MyBB SQL Error

[Kioshi]

I'm getting this error:

MyBB SQL Error
MyBB has experienced an internal SQL error and cannot continue.

SQL Error:
1064 - 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 'WHERE t.fid NOT IN (19,27,31,34,30,32,33,35,28,29,36,37,38,39,20,23,24,21,22,25,' at line 9
Query:
SELECT t.tid, t.fid, t.subject, t.lastpost, t.lastposter, t.lastposteruid, f.name, u.usergroup, u.displaygroup FROM mybb_threads AS t INNER JOIN mybb_forums as f ON (f.fid = t.fid) LEFT JOIN mybb_users AS u ON (t.lastposteruid = u.uid) WHERE t.fid NOT IN (41) WHERE t.fid NOT IN (19,27,31,34,30,32,33,35,28,29,36,37,38,39,20,23,24,21,22,25,26) AND t.visible = '1' GROUP BY t.tid ORDER BY t.lastpost DESC LIMIT 5
Please contact the MyBB Group for technical support.

Whenever I Close two of my categories on the forum page. I'm not quite sure how I fix this? Was wondering if I could get some help. 

Link: http://deviantanime.net / http://deviantanime.net/index.php

Thanks in advance.

[CallingChain]

Could you provide a screnshot/GIF of what you're doing which then causes this error?

[.m.]

that looks like problem with recent posts related plugin. may be its configuration is incorrect.
if forum admin panel is working then plugin settings can be corrected or plugin can be disabled (& uninstalled)

[Kioshi]

that looks like problem with recent posts related plugin. may be its configuration is incorrect.
if forum admin panel is working then plugin settings can be corrected or plugin can be disabled (& uninstalled)

Haha wow! That plugin actually was the problem, I just disabled it for now. Thank you!