case of data corruption? Fatal error: Existing data passed is not an array
 

Version 3.8 vBulletin, I have some specific forumids that are ghosts....

The forumid exists in the mysql db and all appears to be in order.

They do not display even though they are set to be visible. I get no permission for any specific thread or post that corresponds to the given forumid when trying to access it directly via a URL, despite being an admin.

When selecting the corresponding forumid in the admincp, I can see the options for it.

When I attempt to change anything via admincp, such as parent, then I get this error upon submission:

Fatal error: Existing data passed is not an array
Called set_existing in /home/automoti/public_html/vbulletin/admincp/forum.php on line 260
in /home/automoti/public_html/vbulletin/includes/class_dm.php on line 235

Is this a case of data corruption?

Anybody have experience with this peculiar error?

Thanks.