I have a panels node page. I'm trying to show a panels pane based on whether or not my link in field_ticks[0][url] has a value set. Using this visibility rule:

if (isset($node->field_ticks[0]['url'])) {
                $tick_check = FALSE;
              }
            return $tick_check;

I want to hide my pane if the field is set. The print_r($node) shows

[field_ticks] => Array
        (
            [0] => Array
                (
                    [url] => 
                    [title] => 
                    [attributes] => 
                )

        )

so url is not set, right? Not being set, the pane should show but it will not. I've been reading for 9 hours. I've tried dozen's of variations and feel like I have a basic grasp on what should be happening (though I'm beginner level with php coding).

Am I writing something incorrect?