Xthreads another error

[ZiNgA BuRgA]

I've had a look at this for a long time.

The line in question is

PHP Code:

$posthandler->verify_subject();

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The most striking part is the mention of "stdClass".  I can't see how this would ever happen in a stock install.  If $posthandler wasn't set, then it should give a "call to a member function on a non-object" type error.
stdClass is a special PHP class, somewhat like the "default" class for objects without type.  I strongly doubt anyone would deliberately create an object as stdClass, rather, perhaps it is the result of typecasting somewhere - which itself is a bit of a weird thing to do...

Ignoring the above, the actual code has some conditions around it:

PHP Code:

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if($mybb->input['previewpost'] || $editpost) { ... if($editpost || empty($errors)) { ... } else { ... $posthandler->verify_subject();

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Essentially, means that this is only accessible if previewing a post, and creating a new thread.
So it should be impossible to invoke that when trying to submit a new thread (unless you've somehow managed to set previewpost).

I can only think of this being caused by a (seemingly odd) plugin.