Kohana: Undefined index when there is not one

I'm using Kohana 3.1 and I'm getting a very strange error. The Kohana POST handler seems to think that there's an undefined index when there is not one.

Inside of a controller class:

$post = $this->request->post();
var_dump(isset($post['jid'])); //true
$jid = $post['jid']; //Undefined Index error.

If I actually use $post['jid'] it works fine, but it is annoying 开发者_开发技巧to not be able to assign it to a more convenient variable. Anyone have any idea what would cause this?

ErrorException [ Notice ]: Undefined index: jid
84       $jid = $post['jid'];

var_dump of $post:

array(4) { 
    ["jid"]   => string(1) "7" 
    ["topic"] => string(5) "Test1"
    ["entry"] => string(14) "CHECK ONE TWO" 
    ["enter"] => string(4) "POST" 
}

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Altough I believe this is a PEBKAC, you can use $this->request->post('jid') as a getter for that variable.

Maybe you are just skipping the actual POST check?

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Sometimes the problem is not as obvious as the error. The page was 302-redirecting (no post) to itself after completing the action where the post check is done. In fact, the initial post went through properly, but be careful about calling a method on $this when you mean to use another object (at least when $this is a controller). It's still unclear to me why Kohana didn't crash.