Menu Item Locks Up Server

Issue Summary

Hi,
Just installed the lasted dev version.
After activating the module, when I go to a signup page, the server locks up.
When I comment out one of the menu items, this problem goes away.
This is the menu item...
$items[] = array(
'path' => $node_path .'/signups',
'title' => t('Signup status'),
'callback' => 'signup_status_node_admin',
'callback arguments' => array($node),
'access' => $access_all || $access_own,
'type' => MENU_LOCAL_TASK,
'weight' => 20,
);